unslug de: modify

99 files changed, 199 insertions, 99 deletions

diff --git a/files/de/web/javascript/reference/classes/constructor/index.html b/files/de/web/javascript/reference/classes/constructor/index.html
index 5ab83ddcd5..85eadbc22c 100644
--- a/files/de/web/javascript/reference/classes/constructor/index.html
+++ b/files/de/web/javascript/reference/classes/constructor/index.html
@@ -1,11 +1,12 @@
 ---
 title: Konstruktor
-slug: Web/JavaScript/Reference/Klassen/constructor
+slug: Web/JavaScript/Reference/Classes/constructor
 tags:
   - ECMAScript 2015
   - JavaScript
   - Klassen
 translation_of: Web/JavaScript/Reference/Classes/constructor
+original_slug: Web/JavaScript/Reference/Klassen/constructor
 ---
 <div>{{jsSidebar("Classes")}}</div>
 
diff --git a/files/de/web/javascript/reference/classes/extends/index.html b/files/de/web/javascript/reference/classes/extends/index.html
index 29ed8c5e78..bc797f0d46 100644
--- a/files/de/web/javascript/reference/classes/extends/index.html
+++ b/files/de/web/javascript/reference/classes/extends/index.html
@@ -1,11 +1,12 @@
 ---
 title: Erweitern
-slug: Web/JavaScript/Reference/Klassen/extends
+slug: Web/JavaScript/Reference/Classes/extends
 tags:
   - Classes
   - ECMAScript 2015
   - JavaScript
 translation_of: Web/JavaScript/Reference/Classes/extends
+original_slug: Web/JavaScript/Reference/Klassen/extends
 ---
 <div>{{jsSidebar("Classes")}}</div>
 
diff --git a/files/de/web/javascript/reference/classes/index.html b/files/de/web/javascript/reference/classes/index.html
index 81bec0651a..cbafc60a14 100644
--- a/files/de/web/javascript/reference/classes/index.html
+++ b/files/de/web/javascript/reference/classes/index.html
@@ -1,6 +1,6 @@
 ---
 title: Klassen
-slug: Web/JavaScript/Reference/Klassen
+slug: Web/JavaScript/Reference/Classes
 tags:
   - ECMAScript 2015
   - JavaScript
@@ -8,6 +8,7 @@ tags:
   - Konstruktor
   - Vererbung
 translation_of: Web/JavaScript/Reference/Classes
+original_slug: Web/JavaScript/Reference/Klassen
 ---
 <div>{{JsSidebar("Classes")}}</div>
 
diff --git a/files/de/web/javascript/reference/classes/static/index.html b/files/de/web/javascript/reference/classes/static/index.html
index 9c13048498..f9ba577d7b 100644
--- a/files/de/web/javascript/reference/classes/static/index.html
+++ b/files/de/web/javascript/reference/classes/static/index.html
@@ -1,12 +1,13 @@
 ---
 title: Statische Methoden
-slug: Web/JavaScript/Reference/Klassen/static
+slug: Web/JavaScript/Reference/Classes/static
 tags:
   - Classes
   - ECMAScript 2015
   - JavaScript
   - Static
 translation_of: Web/JavaScript/Reference/Classes/static
+original_slug: Web/JavaScript/Reference/Klassen/static
 ---
 <div>{{jsSidebar("Classes")}}</div>
 
diff --git a/files/de/web/javascript/reference/deprecated_and_obsolete_features/index.html b/files/de/web/javascript/reference/deprecated_and_obsolete_features/index.html
index 412bddc553..ccf4939021 100644
--- a/files/de/web/javascript/reference/deprecated_and_obsolete_features/index.html
+++ b/files/de/web/javascript/reference/deprecated_and_obsolete_features/index.html
@@ -1,7 +1,8 @@
 ---
 title: Veraltete und abgeschaffte Features
-slug: Web/JavaScript/Reference/Veraltete_und_abgeschaffte_Features
+slug: Web/JavaScript/Reference/Deprecated_and_obsolete_features
 translation_of: Web/JavaScript/Reference/Deprecated_and_obsolete_features
+original_slug: Web/JavaScript/Reference/Veraltete_und_abgeschaffte_Features
 ---
 <div>{{JsSidebar("More")}}</div>
 
diff --git a/files/de/web/javascript/reference/deprecated_and_obsolete_features/the_legacy_iterator_protocol/index.html b/files/de/web/javascript/reference/deprecated_and_obsolete_features/the_legacy_iterator_protocol/index.html
index 017dcea16a..e9853e554d 100644
--- a/files/de/web/javascript/reference/deprecated_and_obsolete_features/the_legacy_iterator_protocol/index.html
+++ b/files/de/web/javascript/reference/deprecated_and_obsolete_features/the_legacy_iterator_protocol/index.html
@@ -1,7 +1,7 @@
 ---
 title: The legacy Iterator protocol
 slug: >-
-  Web/JavaScript/Reference/Veraltete_und_abgeschaffte_Features/The_legacy_Iterator_protocol
+  Web/JavaScript/Reference/Deprecated_and_obsolete_features/The_legacy_Iterator_protocol
 tags:
   - ES2015
   - JavaScript
@@ -10,6 +10,8 @@ tags:
   - veralteter Iterator
 translation_of: >-
   Web/JavaScript/Reference/Deprecated_and_obsolete_features/The_legacy_Iterator_protocol
+original_slug: >-
+  Web/JavaScript/Reference/Veraltete_und_abgeschaffte_Features/The_legacy_Iterator_protocol
 ---
 <div>{{jsSidebar("More")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/already_has_pragma/index.html b/files/de/web/javascript/reference/errors/already_has_pragma/index.html
index d297d3fea9..0aa6d52e66 100644
--- a/files/de/web/javascript/reference/errors/already_has_pragma/index.html
+++ b/files/de/web/javascript/reference/errors/already_has_pragma/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'Warning: -file- is being assigned a //# sourceMappingURL, but already has one'
-slug: Web/JavaScript/Reference/Fehler/Already_has_pragma
+slug: Web/JavaScript/Reference/Errors/Already_has_pragma
 tags:
   - Error
   - JavaScript
   - Source maps
   - Warning
 translation_of: Web/JavaScript/Reference/Errors/Already_has_pragma
+original_slug: Web/JavaScript/Reference/Fehler/Already_has_pragma
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/array_sort_argument/index.html b/files/de/web/javascript/reference/errors/array_sort_argument/index.html
index 2826cbe4c0..76c86568cf 100644
--- a/files/de/web/javascript/reference/errors/array_sort_argument/index.html
+++ b/files/de/web/javascript/reference/errors/array_sort_argument/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'TypeError: invalid Array.prototype.sort argument'
-slug: Web/JavaScript/Reference/Fehler/Array_sort_argument
+slug: Web/JavaScript/Reference/Errors/Array_sort_argument
 tags:
   - Error
   - JavaScript
   - TypeError
 translation_of: Web/JavaScript/Reference/Errors/Array_sort_argument
+original_slug: Web/JavaScript/Reference/Fehler/Array_sort_argument
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/bad_octal/index.html b/files/de/web/javascript/reference/errors/bad_octal/index.html
index d021c0daa4..4ddabfe7d4 100644
--- a/files/de/web/javascript/reference/errors/bad_octal/index.html
+++ b/files/de/web/javascript/reference/errors/bad_octal/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'Warning: 08/09 is not a legal ECMA-262 octal constant'
-slug: Web/JavaScript/Reference/Fehler/Bad_octal
+slug: Web/JavaScript/Reference/Errors/Bad_octal
 tags:
   - Errors
   - JavaScript
   - SyntaxError
   - Warning
 translation_of: Web/JavaScript/Reference/Errors/Bad_octal
+original_slug: Web/JavaScript/Reference/Fehler/Bad_octal
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/bad_radix/index.html b/files/de/web/javascript/reference/errors/bad_radix/index.html
index 25c473eb93..86e93fb02c 100644
--- a/files/de/web/javascript/reference/errors/bad_radix/index.html
+++ b/files/de/web/javascript/reference/errors/bad_radix/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'RangeError: radix must be an integer'
-slug: Web/JavaScript/Reference/Fehler/Bad_radix
+slug: Web/JavaScript/Reference/Errors/Bad_radix
 tags:
   - Errors
   - JavaScript
   - RangeError
 translation_of: Web/JavaScript/Reference/Errors/Bad_radix
+original_slug: Web/JavaScript/Reference/Fehler/Bad_radix
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/bad_regexp_flag/index.html b/files/de/web/javascript/reference/errors/bad_regexp_flag/index.html
index 5bf381da53..a18dde1589 100644
--- a/files/de/web/javascript/reference/errors/bad_regexp_flag/index.html
+++ b/files/de/web/javascript/reference/errors/bad_regexp_flag/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'SyntaxError: invalid regular expression flag "x"'
-slug: Web/JavaScript/Reference/Fehler/Bad_regexp_flag
+slug: Web/JavaScript/Reference/Errors/Bad_regexp_flag
 tags:
   - Error
   - JavaScript
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/Bad_regexp_flag
+original_slug: Web/JavaScript/Reference/Fehler/Bad_regexp_flag
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/bad_return_or_yield/index.html b/files/de/web/javascript/reference/errors/bad_return_or_yield/index.html
index e850455615..783d153066 100644
--- a/files/de/web/javascript/reference/errors/bad_return_or_yield/index.html
+++ b/files/de/web/javascript/reference/errors/bad_return_or_yield/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'SyntaxError: return not in function'
-slug: Web/JavaScript/Reference/Fehler/Bad_return_or_yield
+slug: Web/JavaScript/Reference/Errors/Bad_return_or_yield
 tags:
   - Errors
   - JavaScript
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/Bad_return_or_yield
+original_slug: Web/JavaScript/Reference/Fehler/Bad_return_or_yield
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/called_on_incompatible_type/index.html b/files/de/web/javascript/reference/errors/called_on_incompatible_type/index.html
index 1915e1b829..720195f9cf 100644
--- a/files/de/web/javascript/reference/errors/called_on_incompatible_type/index.html
+++ b/files/de/web/javascript/reference/errors/called_on_incompatible_type/index.html
@@ -1,11 +1,12 @@
 ---
 title: X.prototype.y called on incompatible type
-slug: Web/JavaScript/Reference/Fehler/Called_on_incompatible_type
+slug: Web/JavaScript/Reference/Errors/Called_on_incompatible_type
 tags:
   - Error
   - JavaScript
   - TypeError
 translation_of: Web/JavaScript/Reference/Errors/Called_on_incompatible_type
+original_slug: Web/JavaScript/Reference/Fehler/Called_on_incompatible_type
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/cant_access_lexical_declaration_before_init/index.html b/files/de/web/javascript/reference/errors/cant_access_lexical_declaration_before_init/index.html
index 16b976aef6..50698f85a0 100644
--- a/files/de/web/javascript/reference/errors/cant_access_lexical_declaration_before_init/index.html
+++ b/files/de/web/javascript/reference/errors/cant_access_lexical_declaration_before_init/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'ReferenceError: can''t access lexical declaration`X'' before initialization'
-slug: Web/JavaScript/Reference/Fehler/Cant_access_lexical_declaration_before_init
+slug: Web/JavaScript/Reference/Errors/Cant_access_lexical_declaration_before_init
 tags:
   - Errors
   - JavaScript
   - ReferenceError
 translation_of: Web/JavaScript/Reference/Errors/Cant_access_lexical_declaration_before_init
+original_slug: Web/JavaScript/Reference/Fehler/Cant_access_lexical_declaration_before_init
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/cant_access_property/index.html b/files/de/web/javascript/reference/errors/cant_access_property/index.html
index 98471eb28e..d98460fd33 100644
--- a/files/de/web/javascript/reference/errors/cant_access_property/index.html
+++ b/files/de/web/javascript/reference/errors/cant_access_property/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'TypeError: can''t access property "x" of "y"'
-slug: Web/JavaScript/Reference/Fehler/Cant_access_property
+slug: Web/JavaScript/Reference/Errors/Cant_access_property
 tags:
   - Fehler
   - JavaScript
   - TypeError
 translation_of: Web/JavaScript/Reference/Errors/Cant_access_property
+original_slug: Web/JavaScript/Reference/Fehler/Cant_access_property
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/cant_define_property_object_not_extensible/index.html b/files/de/web/javascript/reference/errors/cant_define_property_object_not_extensible/index.html
index 691924f427..f9cc6551b1 100644
--- a/files/de/web/javascript/reference/errors/cant_define_property_object_not_extensible/index.html
+++ b/files/de/web/javascript/reference/errors/cant_define_property_object_not_extensible/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'TypeError: can''t define property "x": "obj" is not extensible'
-slug: Web/JavaScript/Reference/Fehler/Cant_define_property_object_not_extensible
+slug: Web/JavaScript/Reference/Errors/Cant_define_property_object_not_extensible
 tags:
   - Error
   - Errors
   - JavaScript
   - TypeError
 translation_of: Web/JavaScript/Reference/Errors/Cant_define_property_object_not_extensible
+original_slug: Web/JavaScript/Reference/Fehler/Cant_define_property_object_not_extensible
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/cant_delete/index.html b/files/de/web/javascript/reference/errors/cant_delete/index.html
index fe09735071..4dcbec6536 100644
--- a/files/de/web/javascript/reference/errors/cant_delete/index.html
+++ b/files/de/web/javascript/reference/errors/cant_delete/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'TypeError: property "x" is non-configurable and can''t be deleted'
-slug: Web/JavaScript/Reference/Fehler/Cant_delete
+slug: Web/JavaScript/Reference/Errors/Cant_delete
 tags:
   - Errors
   - JavaScript
   - Strict Mode
   - TypeError
 translation_of: Web/JavaScript/Reference/Errors/Cant_delete
+original_slug: Web/JavaScript/Reference/Fehler/Cant_delete
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/cant_redefine_property/index.html b/files/de/web/javascript/reference/errors/cant_redefine_property/index.html
index 80ef1e384b..e493cf99fc 100644
--- a/files/de/web/javascript/reference/errors/cant_redefine_property/index.html
+++ b/files/de/web/javascript/reference/errors/cant_redefine_property/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'TypeError: can''t redefine non-configurable property "x"'
-slug: Web/JavaScript/Reference/Fehler/Cant_redefine_property
+slug: Web/JavaScript/Reference/Errors/Cant_redefine_property
 tags:
   - Error
   - Errors
   - JavaScript
   - TypeError
 translation_of: Web/JavaScript/Reference/Errors/Cant_redefine_property
+original_slug: Web/JavaScript/Reference/Fehler/Cant_redefine_property
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/cyclic_object_value/index.html b/files/de/web/javascript/reference/errors/cyclic_object_value/index.html
index 33bf4d508a..06717fc6b9 100644
--- a/files/de/web/javascript/reference/errors/cyclic_object_value/index.html
+++ b/files/de/web/javascript/reference/errors/cyclic_object_value/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'TypeError: cyclic object value'
-slug: Web/JavaScript/Reference/Fehler/Cyclic_object_value
+slug: Web/JavaScript/Reference/Errors/Cyclic_object_value
 tags:
   - Error
   - Errors
   - JavaScript
   - TypeError
 translation_of: Web/JavaScript/Reference/Errors/Cyclic_object_value
+original_slug: Web/JavaScript/Reference/Fehler/Cyclic_object_value
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/dead_object/index.html b/files/de/web/javascript/reference/errors/dead_object/index.html
index 036e637ef4..0925f87d39 100644
--- a/files/de/web/javascript/reference/errors/dead_object/index.html
+++ b/files/de/web/javascript/reference/errors/dead_object/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'TypeError: can''t access dead object'
-slug: Web/JavaScript/Reference/Fehler/Dead_object
+slug: Web/JavaScript/Reference/Errors/Dead_object
 tags:
   - Addon
   - Error
   - Errors
   - JavaScript
 translation_of: Web/JavaScript/Reference/Errors/Dead_object
+original_slug: Web/JavaScript/Reference/Fehler/Dead_object
 ---
 <div>{{JSSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/delete_in_strict_mode/index.html b/files/de/web/javascript/reference/errors/delete_in_strict_mode/index.html
index 042505e066..68d498daa5 100644
--- a/files/de/web/javascript/reference/errors/delete_in_strict_mode/index.html
+++ b/files/de/web/javascript/reference/errors/delete_in_strict_mode/index.html
@@ -2,13 +2,14 @@
 title: >-
   SyntaxError: applying the 'delete' operator to an unqualified name is
   deprecated
-slug: Web/JavaScript/Reference/Fehler/Delete_in_strict_mode
+slug: Web/JavaScript/Reference/Errors/Delete_in_strict_mode
 tags:
   - Error
   - Errors
   - JavaScript
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/Delete_in_strict_mode
+original_slug: Web/JavaScript/Reference/Fehler/Delete_in_strict_mode
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/deprecated_caller_or_arguments_usage/index.html b/files/de/web/javascript/reference/errors/deprecated_caller_or_arguments_usage/index.html
index 15bb0e68b6..6e09f96074 100644
--- a/files/de/web/javascript/reference/errors/deprecated_caller_or_arguments_usage/index.html
+++ b/files/de/web/javascript/reference/errors/deprecated_caller_or_arguments_usage/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'ReferenceError: deprecated caller or arguments usage'
-slug: Web/JavaScript/Reference/Fehler/Deprecated_caller_or_arguments_usage
+slug: Web/JavaScript/Reference/Errors/Deprecated_caller_or_arguments_usage
 tags:
   - Errors
   - JavaScript
   - Strict Mode
   - Warning
 translation_of: Web/JavaScript/Reference/Errors/Deprecated_caller_or_arguments_usage
+original_slug: Web/JavaScript/Reference/Fehler/Deprecated_caller_or_arguments_usage
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/deprecated_expression_closures/index.html b/files/de/web/javascript/reference/errors/deprecated_expression_closures/index.html
index b8c6e7ced8..eee9cb15dd 100644
--- a/files/de/web/javascript/reference/errors/deprecated_expression_closures/index.html
+++ b/files/de/web/javascript/reference/errors/deprecated_expression_closures/index.html
@@ -1,10 +1,11 @@
 ---
 title: 'Warning: expression closures are deprecated'
-slug: Web/JavaScript/Reference/Fehler/Deprecated_expression_closures
+slug: Web/JavaScript/Reference/Errors/Deprecated_expression_closures
 tags:
   - JavaScript
   - Warning
 translation_of: Web/JavaScript/Reference/Errors/Deprecated_expression_closures
+original_slug: Web/JavaScript/Reference/Fehler/Deprecated_expression_closures
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/deprecated_octal/index.html b/files/de/web/javascript/reference/errors/deprecated_octal/index.html
index e153038950..8e67938033 100644
--- a/files/de/web/javascript/reference/errors/deprecated_octal/index.html
+++ b/files/de/web/javascript/reference/errors/deprecated_octal/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'SyntaxError: "0"-prefixed octal literals and octal escape seq. are deprecated'
-slug: Web/JavaScript/Reference/Fehler/Deprecated_octal
+slug: Web/JavaScript/Reference/Errors/Deprecated_octal
 tags:
   - Error
   - JavaScript
   - Strict Mode
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/Deprecated_octal
+original_slug: Web/JavaScript/Reference/Fehler/Deprecated_octal
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/deprecated_source_map_pragma/index.html b/files/de/web/javascript/reference/errors/deprecated_source_map_pragma/index.html
index 1f87b2bd2d..380ab5507b 100644
--- a/files/de/web/javascript/reference/errors/deprecated_source_map_pragma/index.html
+++ b/files/de/web/javascript/reference/errors/deprecated_source_map_pragma/index.html
@@ -2,12 +2,13 @@
 title: >-
   SyntaxError: Using //@ to indicate sourceURL pragmas is deprecated. Use //#
   instead
-slug: Web/JavaScript/Reference/Fehler/Deprecated_source_map_pragma
+slug: Web/JavaScript/Reference/Errors/Deprecated_source_map_pragma
 tags:
   - Errors
   - JavaScript
   - Source maps
 translation_of: Web/JavaScript/Reference/Errors/Deprecated_source_map_pragma
+original_slug: Web/JavaScript/Reference/Fehler/Deprecated_source_map_pragma
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/deprecated_string_generics/index.html b/files/de/web/javascript/reference/errors/deprecated_string_generics/index.html
index d495448759..b41254150e 100644
--- a/files/de/web/javascript/reference/errors/deprecated_string_generics/index.html
+++ b/files/de/web/javascript/reference/errors/deprecated_string_generics/index.html
@@ -1,10 +1,11 @@
 ---
 title: 'Warning: String.x is deprecated; use String.prototype.x instead'
-slug: Web/JavaScript/Reference/Fehler/Deprecated_String_generics
+slug: Web/JavaScript/Reference/Errors/Deprecated_String_generics
 tags:
   - JavaScript
   - Warning
 translation_of: Web/JavaScript/Reference/Errors/Deprecated_String_generics
+original_slug: Web/JavaScript/Reference/Fehler/Deprecated_String_generics
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/deprecated_tolocaleformat/index.html b/files/de/web/javascript/reference/errors/deprecated_tolocaleformat/index.html
index 31cc81d9cc..32ae0382d3 100644
--- a/files/de/web/javascript/reference/errors/deprecated_tolocaleformat/index.html
+++ b/files/de/web/javascript/reference/errors/deprecated_tolocaleformat/index.html
@@ -1,10 +1,11 @@
 ---
 title: 'Warning: Date.prototype.toLocaleFormat is deprecated'
-slug: Web/JavaScript/Reference/Fehler/Deprecated_toLocaleFormat
+slug: Web/JavaScript/Reference/Errors/Deprecated_toLocaleFormat
 tags:
   - JavaScript
   - Warning
 translation_of: Web/JavaScript/Reference/Errors/Deprecated_toLocaleFormat
+original_slug: Web/JavaScript/Reference/Fehler/Deprecated_toLocaleFormat
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/equal_as_assign/index.html b/files/de/web/javascript/reference/errors/equal_as_assign/index.html
index dbe5e55b02..3df46b90f0 100644
--- a/files/de/web/javascript/reference/errors/equal_as_assign/index.html
+++ b/files/de/web/javascript/reference/errors/equal_as_assign/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'SyntaxError: test for equality (==) mistyped as assignment (=)?'
-slug: Web/JavaScript/Reference/Fehler/Equal_as_assign
+slug: Web/JavaScript/Reference/Errors/Equal_as_assign
 tags:
   - Errors
   - JavaScript
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/Equal_as_assign
+original_slug: Web/JavaScript/Reference/Fehler/Equal_as_assign
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/for-each-in_loops_are_deprecated/index.html b/files/de/web/javascript/reference/errors/for-each-in_loops_are_deprecated/index.html
index 2651ea45ba..871ec8f106 100644
--- a/files/de/web/javascript/reference/errors/for-each-in_loops_are_deprecated/index.html
+++ b/files/de/web/javascript/reference/errors/for-each-in_loops_are_deprecated/index.html
@@ -1,10 +1,11 @@
 ---
 title: 'Warning: JavaScript 1.6''s for-each-in loops are deprecated'
-slug: Web/JavaScript/Reference/Fehler/For-each-in_loops_are_deprecated
+slug: Web/JavaScript/Reference/Errors/For-each-in_loops_are_deprecated
 tags:
   - JavaScript
   - Warning
 translation_of: Web/JavaScript/Reference/Errors/For-each-in_loops_are_deprecated
+original_slug: Web/JavaScript/Reference/Fehler/For-each-in_loops_are_deprecated
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/getter_only/index.html b/files/de/web/javascript/reference/errors/getter_only/index.html
index 268ee0cbf1..709490012c 100644
--- a/files/de/web/javascript/reference/errors/getter_only/index.html
+++ b/files/de/web/javascript/reference/errors/getter_only/index.html
@@ -1,6 +1,6 @@
 ---
 title: 'TypeError: setting getter-only property "x"'
-slug: Web/JavaScript/Reference/Fehler/Getter_only
+slug: Web/JavaScript/Reference/Errors/Getter_only
 tags:
   - Error
   - Errors
@@ -8,6 +8,7 @@ tags:
   - Strict Mode
   - TypeError
 translation_of: Web/JavaScript/Reference/Errors/Getter_only
+original_slug: Web/JavaScript/Reference/Fehler/Getter_only
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/identifier_after_number/index.html b/files/de/web/javascript/reference/errors/identifier_after_number/index.html
index 64cb9cdfe3..b541d40ed2 100644
--- a/files/de/web/javascript/reference/errors/identifier_after_number/index.html
+++ b/files/de/web/javascript/reference/errors/identifier_after_number/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'SyntaxError: identifier starts immediately after numeric literal'
-slug: Web/JavaScript/Reference/Fehler/Identifier_after_number
+slug: Web/JavaScript/Reference/Errors/Identifier_after_number
 tags:
   - Error
   - Errors
   - JavaScript
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/Identifier_after_number
+original_slug: Web/JavaScript/Reference/Fehler/Identifier_after_number
 ---
 <div>{{JSSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/illegal_character/index.html b/files/de/web/javascript/reference/errors/illegal_character/index.html
index e0c083022c..1b4c735f2e 100644
--- a/files/de/web/javascript/reference/errors/illegal_character/index.html
+++ b/files/de/web/javascript/reference/errors/illegal_character/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'SyntaxError: illegal character'
-slug: Web/JavaScript/Reference/Fehler/Illegal_character
+slug: Web/JavaScript/Reference/Errors/Illegal_character
 tags:
   - Error
   - Errors
   - JavaScript
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/Illegal_character
+original_slug: Web/JavaScript/Reference/Fehler/Illegal_character
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/in_operator_no_object/index.html b/files/de/web/javascript/reference/errors/in_operator_no_object/index.html
index 6bace66437..f2b63188a6 100644
--- a/files/de/web/javascript/reference/errors/in_operator_no_object/index.html
+++ b/files/de/web/javascript/reference/errors/in_operator_no_object/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'TypeError: cannot use ''in'' operator to search for ''x'' in ''y'''
-slug: Web/JavaScript/Reference/Fehler/in_operator_no_object
+slug: Web/JavaScript/Reference/Errors/in_operator_no_object
 tags:
   - Error
   - Errors
   - JavaScript
   - TypeError
 translation_of: Web/JavaScript/Reference/Errors/in_operator_no_object
+original_slug: Web/JavaScript/Reference/Fehler/in_operator_no_object
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/index.html b/files/de/web/javascript/reference/errors/index.html
index 67809031e7..4db2dbf2a5 100644
--- a/files/de/web/javascript/reference/errors/index.html
+++ b/files/de/web/javascript/reference/errors/index.html
@@ -1,6 +1,6 @@
 ---
 title: JavaScript Fehler Referenz
-slug: Web/JavaScript/Reference/Fehler
+slug: Web/JavaScript/Reference/Errors
 tags:
   - Debugging
   - Error
@@ -9,6 +9,7 @@ tags:
   - JavaScript
   - exceptions
 translation_of: Web/JavaScript/Reference/Errors
+original_slug: Web/JavaScript/Reference/Fehler
 ---
 <p>{{jsSidebar("Errors")}}</p>
 
diff --git a/files/de/web/javascript/reference/errors/invalid_array_length/index.html b/files/de/web/javascript/reference/errors/invalid_array_length/index.html
index 34edeb2969..002c0f1214 100644
--- a/files/de/web/javascript/reference/errors/invalid_array_length/index.html
+++ b/files/de/web/javascript/reference/errors/invalid_array_length/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'RangeError: invalid array length'
-slug: Web/JavaScript/Reference/Fehler/Invalid_array_length
+slug: Web/JavaScript/Reference/Errors/Invalid_array_length
 tags:
   - Errors
   - JavaScript
   - RangeError
 translation_of: Web/JavaScript/Reference/Errors/Invalid_array_length
+original_slug: Web/JavaScript/Reference/Fehler/Invalid_array_length
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/invalid_assignment_left-hand_side/index.html b/files/de/web/javascript/reference/errors/invalid_assignment_left-hand_side/index.html
index 6e727fb9a2..0e8e79f5e6 100644
--- a/files/de/web/javascript/reference/errors/invalid_assignment_left-hand_side/index.html
+++ b/files/de/web/javascript/reference/errors/invalid_assignment_left-hand_side/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'ReferenceError: invalid assignment left-hand side'
-slug: Web/JavaScript/Reference/Fehler/Invalid_assignment_left-hand_side
+slug: Web/JavaScript/Reference/Errors/Invalid_assignment_left-hand_side
 tags:
   - Errors
   - JavaScript
   - ReferenceError
 translation_of: Web/JavaScript/Reference/Errors/Invalid_assignment_left-hand_side
+original_slug: Web/JavaScript/Reference/Fehler/Invalid_assignment_left-hand_side
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/invalid_const_assignment/index.html b/files/de/web/javascript/reference/errors/invalid_const_assignment/index.html
index 812577360a..8b2a52c36d 100644
--- a/files/de/web/javascript/reference/errors/invalid_const_assignment/index.html
+++ b/files/de/web/javascript/reference/errors/invalid_const_assignment/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'TypeError: invalid assignment to const "x"'
-slug: Web/JavaScript/Reference/Fehler/Invalid_const_assignment
+slug: Web/JavaScript/Reference/Errors/Invalid_const_assignment
 tags:
   - Error
   - JavaScript
   - TypeError
 translation_of: Web/JavaScript/Reference/Errors/Invalid_const_assignment
+original_slug: Web/JavaScript/Reference/Fehler/Invalid_const_assignment
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/invalid_date/index.html b/files/de/web/javascript/reference/errors/invalid_date/index.html
index 04954fe28f..cd5a75f969 100644
--- a/files/de/web/javascript/reference/errors/invalid_date/index.html
+++ b/files/de/web/javascript/reference/errors/invalid_date/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'RangeError: invalid date'
-slug: Web/JavaScript/Reference/Fehler/Invalid_date
+slug: Web/JavaScript/Reference/Errors/Invalid_date
 tags:
   - Errors
   - JavaScript
   - RangeError
 translation_of: Web/JavaScript/Reference/Errors/Invalid_date
+original_slug: Web/JavaScript/Reference/Fehler/Invalid_date
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/invalid_for-in_initializer/index.html b/files/de/web/javascript/reference/errors/invalid_for-in_initializer/index.html
index bc4bf80c70..497f30fa3e 100644
--- a/files/de/web/javascript/reference/errors/invalid_for-in_initializer/index.html
+++ b/files/de/web/javascript/reference/errors/invalid_for-in_initializer/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'SyntaxError: for-in loop head declarations may not have initializers'
-slug: Web/JavaScript/Reference/Fehler/Invalid_for-in_initializer
+slug: Web/JavaScript/Reference/Errors/Invalid_for-in_initializer
 tags:
   - Error
   - JavaScript
   - Strict Mode
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/Invalid_for-in_initializer
+original_slug: Web/JavaScript/Reference/Fehler/Invalid_for-in_initializer
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/invalid_for-of_initializer/index.html b/files/de/web/javascript/reference/errors/invalid_for-of_initializer/index.html
index 3270387357..5e5abead7d 100644
--- a/files/de/web/javascript/reference/errors/invalid_for-of_initializer/index.html
+++ b/files/de/web/javascript/reference/errors/invalid_for-of_initializer/index.html
@@ -2,12 +2,13 @@
 title: >-
   SyntaxError: a declaration in the head of a for-of loop can't have an
   initializer
-slug: Web/JavaScript/Reference/Fehler/Invalid_for-of_initializer
+slug: Web/JavaScript/Reference/Errors/Invalid_for-of_initializer
 tags:
   - Error
   - JavaScript
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/Invalid_for-of_initializer
+original_slug: Web/JavaScript/Reference/Fehler/Invalid_for-of_initializer
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/invalid_right_hand_side_instanceof_operand/index.html b/files/de/web/javascript/reference/errors/invalid_right_hand_side_instanceof_operand/index.html
index 771838b428..45e7fb3cac 100644
--- a/files/de/web/javascript/reference/errors/invalid_right_hand_side_instanceof_operand/index.html
+++ b/files/de/web/javascript/reference/errors/invalid_right_hand_side_instanceof_operand/index.html
@@ -1,6 +1,6 @@
 ---
 title: 'TypeError: invalid ''instanceof'' operand ''x'''
-slug: Web/JavaScript/Reference/Fehler/invalid_right_hand_side_instanceof_operand
+slug: Web/JavaScript/Reference/Errors/invalid_right_hand_side_instanceof_operand
 tags:
   - Error
   - Errors
@@ -8,6 +8,7 @@ tags:
   - Reference
   - TypeError
 translation_of: Web/JavaScript/Reference/Errors/invalid_right_hand_side_instanceof_operand
+original_slug: Web/JavaScript/Reference/Fehler/invalid_right_hand_side_instanceof_operand
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/is_not_iterable/index.html b/files/de/web/javascript/reference/errors/is_not_iterable/index.html
index 21460882c7..d1a42abf9c 100644
--- a/files/de/web/javascript/reference/errors/is_not_iterable/index.html
+++ b/files/de/web/javascript/reference/errors/is_not_iterable/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'TypeError: ''x'' is not iterable'
-slug: Web/JavaScript/Reference/Fehler/is_not_iterable
+slug: Web/JavaScript/Reference/Errors/is_not_iterable
 tags:
   - Error
   - JavaScript
   - Reference
   - TypeError
 translation_of: Web/JavaScript/Reference/Errors/is_not_iterable
+original_slug: Web/JavaScript/Reference/Fehler/is_not_iterable
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/json_bad_parse/index.html b/files/de/web/javascript/reference/errors/json_bad_parse/index.html
index 0aa5e6bdae..17e4f53615 100644
--- a/files/de/web/javascript/reference/errors/json_bad_parse/index.html
+++ b/files/de/web/javascript/reference/errors/json_bad_parse/index.html
@@ -1,6 +1,6 @@
 ---
 title: 'SyntaxError: JSON.parse: bad parsing'
-slug: Web/JavaScript/Reference/Fehler/JSON_bad_parse
+slug: Web/JavaScript/Reference/Errors/JSON_bad_parse
 tags:
   - Errors
   - JSON
@@ -9,6 +9,7 @@ tags:
   - Property
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/JSON_bad_parse
+original_slug: Web/JavaScript/Reference/Fehler/JSON_bad_parse
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/malformed_formal_parameter/index.html b/files/de/web/javascript/reference/errors/malformed_formal_parameter/index.html
index 65a89bb84a..8ba3b06c1e 100644
--- a/files/de/web/javascript/reference/errors/malformed_formal_parameter/index.html
+++ b/files/de/web/javascript/reference/errors/malformed_formal_parameter/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'SyntaxError: Malformed formal parameter'
-slug: Web/JavaScript/Reference/Fehler/Malformed_formal_parameter
+slug: Web/JavaScript/Reference/Errors/Malformed_formal_parameter
 tags:
   - Error
   - JavaScript
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/Malformed_formal_parameter
+original_slug: Web/JavaScript/Reference/Fehler/Malformed_formal_parameter
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/malformed_uri/index.html b/files/de/web/javascript/reference/errors/malformed_uri/index.html
index cf831aa4a6..c26bc37c20 100644
--- a/files/de/web/javascript/reference/errors/malformed_uri/index.html
+++ b/files/de/web/javascript/reference/errors/malformed_uri/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'URIError: malformed URI sequence'
-slug: Web/JavaScript/Reference/Fehler/Malformed_URI
+slug: Web/JavaScript/Reference/Errors/Malformed_URI
 tags:
   - Error
   - Errors
   - JavaScript
   - URIError
 translation_of: Web/JavaScript/Reference/Errors/Malformed_URI
+original_slug: Web/JavaScript/Reference/Fehler/Malformed_URI
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/missing_bracket_after_list/index.html b/files/de/web/javascript/reference/errors/missing_bracket_after_list/index.html
index b5fe14ae14..0c34bae3fc 100644
--- a/files/de/web/javascript/reference/errors/missing_bracket_after_list/index.html
+++ b/files/de/web/javascript/reference/errors/missing_bracket_after_list/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'SyntaxError: missing ] after element list'
-slug: Web/JavaScript/Reference/Fehler/Missing_bracket_after_list
+slug: Web/JavaScript/Reference/Errors/Missing_bracket_after_list
 tags:
   - Errors
   - JavaScript
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/Missing_bracket_after_list
+original_slug: Web/JavaScript/Reference/Fehler/Missing_bracket_after_list
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/missing_colon_after_property_id/index.html b/files/de/web/javascript/reference/errors/missing_colon_after_property_id/index.html
index 26d515a018..f1691f9461 100644
--- a/files/de/web/javascript/reference/errors/missing_colon_after_property_id/index.html
+++ b/files/de/web/javascript/reference/errors/missing_colon_after_property_id/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'SyntaxError: missing : after property id'
-slug: Web/JavaScript/Reference/Fehler/Missing_colon_after_property_id
+slug: Web/JavaScript/Reference/Errors/Missing_colon_after_property_id
 tags:
   - Error
   - Errors
   - JavaScript
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/Missing_colon_after_property_id
+original_slug: Web/JavaScript/Reference/Fehler/Missing_colon_after_property_id
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/missing_curly_after_function_body/index.html b/files/de/web/javascript/reference/errors/missing_curly_after_function_body/index.html
index b5e0239a2f..03cfcf2930 100644
--- a/files/de/web/javascript/reference/errors/missing_curly_after_function_body/index.html
+++ b/files/de/web/javascript/reference/errors/missing_curly_after_function_body/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'SyntaxError: missing } after function body'
-slug: Web/JavaScript/Reference/Fehler/Missing_curly_after_function_body
+slug: Web/JavaScript/Reference/Errors/Missing_curly_after_function_body
 tags:
   - Error
   - Errors
   - JavaScript
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/Missing_curly_after_function_body
+original_slug: Web/JavaScript/Reference/Fehler/Missing_curly_after_function_body
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/missing_curly_after_property_list/index.html b/files/de/web/javascript/reference/errors/missing_curly_after_property_list/index.html
index 41a82a9158..ea58232fcf 100644
--- a/files/de/web/javascript/reference/errors/missing_curly_after_property_list/index.html
+++ b/files/de/web/javascript/reference/errors/missing_curly_after_property_list/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'SyntaxError: missing } after property list'
-slug: Web/JavaScript/Reference/Fehler/Missing_curly_after_property_list
+slug: Web/JavaScript/Reference/Errors/Missing_curly_after_property_list
 tags:
   - Errors
   - JavaScript
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/Missing_curly_after_property_list
+original_slug: Web/JavaScript/Reference/Fehler/Missing_curly_after_property_list
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/missing_formal_parameter/index.html b/files/de/web/javascript/reference/errors/missing_formal_parameter/index.html
index 19813f9c47..c520773f9e 100644
--- a/files/de/web/javascript/reference/errors/missing_formal_parameter/index.html
+++ b/files/de/web/javascript/reference/errors/missing_formal_parameter/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'SyntaxError: missing formal parameter'
-slug: Web/JavaScript/Reference/Fehler/Missing_formal_parameter
+slug: Web/JavaScript/Reference/Errors/Missing_formal_parameter
 tags:
   - Error
   - Errors
   - JavaScript
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/Missing_formal_parameter
+original_slug: Web/JavaScript/Reference/Fehler/Missing_formal_parameter
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/missing_initializer_in_const/index.html b/files/de/web/javascript/reference/errors/missing_initializer_in_const/index.html
index 49db779546..30f9c8ead1 100644
--- a/files/de/web/javascript/reference/errors/missing_initializer_in_const/index.html
+++ b/files/de/web/javascript/reference/errors/missing_initializer_in_const/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'SyntaxError: missing = in const declaration'
-slug: Web/JavaScript/Reference/Fehler/Missing_initializer_in_const
+slug: Web/JavaScript/Reference/Errors/Missing_initializer_in_const
 tags:
   - Error
   - JavaScript
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/Missing_initializer_in_const
+original_slug: Web/JavaScript/Reference/Fehler/Missing_initializer_in_const
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/missing_name_after_dot_operator/index.html b/files/de/web/javascript/reference/errors/missing_name_after_dot_operator/index.html
index cb79bdcc03..d4e34749c0 100644
--- a/files/de/web/javascript/reference/errors/missing_name_after_dot_operator/index.html
+++ b/files/de/web/javascript/reference/errors/missing_name_after_dot_operator/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'SyntaxError: missing name after . operator'
-slug: Web/JavaScript/Reference/Fehler/Missing_name_after_dot_operator
+slug: Web/JavaScript/Reference/Errors/Missing_name_after_dot_operator
 tags:
   - Error
   - Errors
   - JavaScript
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/Missing_name_after_dot_operator
+original_slug: Web/JavaScript/Reference/Fehler/Missing_name_after_dot_operator
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/missing_parenthesis_after_argument_list/index.html b/files/de/web/javascript/reference/errors/missing_parenthesis_after_argument_list/index.html
index a3da4b9edf..7fc8a953bd 100644
--- a/files/de/web/javascript/reference/errors/missing_parenthesis_after_argument_list/index.html
+++ b/files/de/web/javascript/reference/errors/missing_parenthesis_after_argument_list/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'SyntaxError: missing ) after argument list'
-slug: Web/JavaScript/Reference/Fehler/Missing_parenthesis_after_argument_list
+slug: Web/JavaScript/Reference/Errors/Missing_parenthesis_after_argument_list
 tags:
   - Errors
   - JavaScript
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/Missing_parenthesis_after_argument_list
+original_slug: Web/JavaScript/Reference/Fehler/Missing_parenthesis_after_argument_list
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/missing_parenthesis_after_condition/index.html b/files/de/web/javascript/reference/errors/missing_parenthesis_after_condition/index.html
index 295428a5b9..0946c8f3f7 100644
--- a/files/de/web/javascript/reference/errors/missing_parenthesis_after_condition/index.html
+++ b/files/de/web/javascript/reference/errors/missing_parenthesis_after_condition/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'SyntaxError: missing ) after condition'
-slug: Web/JavaScript/Reference/Fehler/Missing_parenthesis_after_condition
+slug: Web/JavaScript/Reference/Errors/Missing_parenthesis_after_condition
 tags:
   - Error
   - Errors
   - JavaScript
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/Missing_parenthesis_after_condition
+original_slug: Web/JavaScript/Reference/Fehler/Missing_parenthesis_after_condition
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/missing_semicolon_before_statement/index.html b/files/de/web/javascript/reference/errors/missing_semicolon_before_statement/index.html
index dcdf35ed94..5425efd490 100644
--- a/files/de/web/javascript/reference/errors/missing_semicolon_before_statement/index.html
+++ b/files/de/web/javascript/reference/errors/missing_semicolon_before_statement/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'SyntaxError: missing ; before statement'
-slug: Web/JavaScript/Reference/Fehler/Missing_semicolon_before_statement
+slug: Web/JavaScript/Reference/Errors/Missing_semicolon_before_statement
 tags:
   - Errors
   - JavaScript
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/Missing_semicolon_before_statement
+original_slug: Web/JavaScript/Reference/Fehler/Missing_semicolon_before_statement
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/more_arguments_needed/index.html b/files/de/web/javascript/reference/errors/more_arguments_needed/index.html
index 3707c5446f..43ba1f0af4 100644
--- a/files/de/web/javascript/reference/errors/more_arguments_needed/index.html
+++ b/files/de/web/javascript/reference/errors/more_arguments_needed/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'TypeError: More arguments needed'
-slug: Web/JavaScript/Reference/Fehler/More_arguments_needed
+slug: Web/JavaScript/Reference/Errors/More_arguments_needed
 tags:
   - Errors
   - JavaScript
   - TypeError
 translation_of: Web/JavaScript/Reference/Errors/More_arguments_needed
+original_slug: Web/JavaScript/Reference/Fehler/More_arguments_needed
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/negative_repetition_count/index.html b/files/de/web/javascript/reference/errors/negative_repetition_count/index.html
index 53c153453f..a90f31e9d4 100644
--- a/files/de/web/javascript/reference/errors/negative_repetition_count/index.html
+++ b/files/de/web/javascript/reference/errors/negative_repetition_count/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'RangeError: repeat count must be non-negative'
-slug: Web/JavaScript/Reference/Fehler/Negative_repetition_count
+slug: Web/JavaScript/Reference/Errors/Negative_repetition_count
 tags:
   - Errors
   - JavaScript
   - RangeError
 translation_of: Web/JavaScript/Reference/Errors/Negative_repetition_count
+original_slug: Web/JavaScript/Reference/Fehler/Negative_repetition_count
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/no_non-null_object/index.html b/files/de/web/javascript/reference/errors/no_non-null_object/index.html
index a2c897c5cd..41be7379df 100644
--- a/files/de/web/javascript/reference/errors/no_non-null_object/index.html
+++ b/files/de/web/javascript/reference/errors/no_non-null_object/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'TypeError: "x" is not a non-null object'
-slug: Web/JavaScript/Reference/Fehler/No_non-null_object
+slug: Web/JavaScript/Reference/Errors/No_non-null_object
 tags:
   - Error
   - Errors
   - JavaScript
   - TypeError
 translation_of: Web/JavaScript/Reference/Errors/No_non-null_object
+original_slug: Web/JavaScript/Reference/Fehler/No_non-null_object
 ---
 <div>{{JSSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/no_properties/index.html b/files/de/web/javascript/reference/errors/no_properties/index.html
index d5dc0328b6..0897961a8e 100644
--- a/files/de/web/javascript/reference/errors/no_properties/index.html
+++ b/files/de/web/javascript/reference/errors/no_properties/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'TypeError: "x" has no properties'
-slug: Web/JavaScript/Reference/Fehler/No_properties
+slug: Web/JavaScript/Reference/Errors/No_properties
 tags:
   - Errors
   - JavaScript
   - TypeError
 translation_of: Web/JavaScript/Reference/Errors/No_properties
+original_slug: Web/JavaScript/Reference/Fehler/No_properties
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/no_variable_name/index.html b/files/de/web/javascript/reference/errors/no_variable_name/index.html
index a3b63df55d..cd5e7fa698 100644
--- a/files/de/web/javascript/reference/errors/no_variable_name/index.html
+++ b/files/de/web/javascript/reference/errors/no_variable_name/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'SyntaxError: missing variable name'
-slug: Web/JavaScript/Reference/Fehler/No_variable_name
+slug: Web/JavaScript/Reference/Errors/No_variable_name
 tags:
   - Error
   - Errors
   - JavaScript
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/No_variable_name
+original_slug: Web/JavaScript/Reference/Fehler/No_variable_name
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/non_configurable_array_element/index.html b/files/de/web/javascript/reference/errors/non_configurable_array_element/index.html
index 771f480dda..0b3cea9e27 100644
--- a/files/de/web/javascript/reference/errors/non_configurable_array_element/index.html
+++ b/files/de/web/javascript/reference/errors/non_configurable_array_element/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'TypeError: can''t delete non-configurable array element'
-slug: Web/JavaScript/Reference/Fehler/Non_configurable_array_element
+slug: Web/JavaScript/Reference/Errors/Non_configurable_array_element
 tags:
   - Error
   - Errors
   - JavaScript
   - TypeError
 translation_of: Web/JavaScript/Reference/Errors/Non_configurable_array_element
+original_slug: Web/JavaScript/Reference/Fehler/Non_configurable_array_element
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/not_a_codepoint/index.html b/files/de/web/javascript/reference/errors/not_a_codepoint/index.html
index 8d72c3be4b..544317daf1 100644
--- a/files/de/web/javascript/reference/errors/not_a_codepoint/index.html
+++ b/files/de/web/javascript/reference/errors/not_a_codepoint/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'RangeError: argument is not a valid code point'
-slug: Web/JavaScript/Reference/Fehler/Not_a_codepoint
+slug: Web/JavaScript/Reference/Errors/Not_a_codepoint
 tags:
   - Errors
   - JavaScript
   - RangeError
 translation_of: Web/JavaScript/Reference/Errors/Not_a_codepoint
+original_slug: Web/JavaScript/Reference/Fehler/Not_a_codepoint
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/not_a_constructor/index.html b/files/de/web/javascript/reference/errors/not_a_constructor/index.html
index 42858cf706..2768a87600 100644
--- a/files/de/web/javascript/reference/errors/not_a_constructor/index.html
+++ b/files/de/web/javascript/reference/errors/not_a_constructor/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'TypeError: "x" is not a constructor'
-slug: Web/JavaScript/Reference/Fehler/Not_a_constructor
+slug: Web/JavaScript/Reference/Errors/Not_a_constructor
 tags:
   - Fehler
   - JavaScript
   - TypeError
 translation_of: Web/JavaScript/Reference/Errors/Not_a_constructor
+original_slug: Web/JavaScript/Reference/Fehler/Not_a_constructor
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/not_a_function/index.html b/files/de/web/javascript/reference/errors/not_a_function/index.html
index a8b66dff17..8a46ca4b60 100644
--- a/files/de/web/javascript/reference/errors/not_a_function/index.html
+++ b/files/de/web/javascript/reference/errors/not_a_function/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'TypeError: "x" is not a function'
-slug: Web/JavaScript/Reference/Fehler/Not_a_function
+slug: Web/JavaScript/Reference/Errors/Not_a_function
 tags:
   - Errors
   - JavaScript
   - TypeError
 translation_of: Web/JavaScript/Reference/Errors/Not_a_function
+original_slug: Web/JavaScript/Reference/Fehler/Not_a_function
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/not_defined/index.html b/files/de/web/javascript/reference/errors/not_defined/index.html
index 030c47536b..17556650c7 100644
--- a/files/de/web/javascript/reference/errors/not_defined/index.html
+++ b/files/de/web/javascript/reference/errors/not_defined/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'ReferenceError: "x" is not defined'
-slug: Web/JavaScript/Reference/Fehler/Not_defined
+slug: Web/JavaScript/Reference/Errors/Not_defined
 tags:
   - Error
   - JavaScript
   - ReferenceError
 translation_of: Web/JavaScript/Reference/Errors/Not_defined
+original_slug: Web/JavaScript/Reference/Fehler/Not_defined
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/precision_range/index.html b/files/de/web/javascript/reference/errors/precision_range/index.html
index d03b4203c5..43e8210a44 100644
--- a/files/de/web/javascript/reference/errors/precision_range/index.html
+++ b/files/de/web/javascript/reference/errors/precision_range/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'RangeError: precision is out of range'
-slug: Web/JavaScript/Reference/Fehler/Precision_range
+slug: Web/JavaScript/Reference/Errors/Precision_range
 tags:
   - Errors
   - JavaScript
   - RangeError
 translation_of: Web/JavaScript/Reference/Errors/Precision_range
+original_slug: Web/JavaScript/Reference/Fehler/Precision_range
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/property_access_denied/index.html b/files/de/web/javascript/reference/errors/property_access_denied/index.html
index d4feb4feb7..94871832ef 100644
--- a/files/de/web/javascript/reference/errors/property_access_denied/index.html
+++ b/files/de/web/javascript/reference/errors/property_access_denied/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'Error: Permission denied to access property "x"'
-slug: Web/JavaScript/Reference/Fehler/Property_access_denied
+slug: Web/JavaScript/Reference/Errors/Property_access_denied
 tags:
   - Error
   - Errors
   - JavaScript
   - Security
 translation_of: Web/JavaScript/Reference/Errors/Property_access_denied
+original_slug: Web/JavaScript/Reference/Fehler/Property_access_denied
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/read-only/index.html b/files/de/web/javascript/reference/errors/read-only/index.html
index bb56305880..76a7d79e27 100644
--- a/files/de/web/javascript/reference/errors/read-only/index.html
+++ b/files/de/web/javascript/reference/errors/read-only/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'TypeError: "x" is read-only'
-slug: Web/JavaScript/Reference/Fehler/Read-only
+slug: Web/JavaScript/Reference/Errors/Read-only
 tags:
   - Errors
   - JavaScript
   - TypeError
 translation_of: Web/JavaScript/Reference/Errors/Read-only
+original_slug: Web/JavaScript/Reference/Fehler/Read-only
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/redeclared_parameter/index.html b/files/de/web/javascript/reference/errors/redeclared_parameter/index.html
index e80836e50f..c13f2ec181 100644
--- a/files/de/web/javascript/reference/errors/redeclared_parameter/index.html
+++ b/files/de/web/javascript/reference/errors/redeclared_parameter/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'SyntaxError: redeclaration of formal parameter "x"'
-slug: Web/JavaScript/Reference/Fehler/Redeclared_parameter
+slug: Web/JavaScript/Reference/Errors/Redeclared_parameter
 tags:
   - Errors
   - JavaScript
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/Redeclared_parameter
+original_slug: Web/JavaScript/Reference/Fehler/Redeclared_parameter
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/reduce_of_empty_array_with_no_initial_value/index.html b/files/de/web/javascript/reference/errors/reduce_of_empty_array_with_no_initial_value/index.html
index a1a9a43748..3f0ac84872 100644
--- a/files/de/web/javascript/reference/errors/reduce_of_empty_array_with_no_initial_value/index.html
+++ b/files/de/web/javascript/reference/errors/reduce_of_empty_array_with_no_initial_value/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'TypeError: Reduce of empty array with no initial value'
-slug: Web/JavaScript/Reference/Fehler/Reduce_of_empty_array_with_no_initial_value
+slug: Web/JavaScript/Reference/Errors/Reduce_of_empty_array_with_no_initial_value
 tags:
   - Error
   - JavaScript
   - Reference
   - TypeError
 translation_of: Web/JavaScript/Reference/Errors/Reduce_of_empty_array_with_no_initial_value
+original_slug: Web/JavaScript/Reference/Fehler/Reduce_of_empty_array_with_no_initial_value
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/reserved_identifier/index.html b/files/de/web/javascript/reference/errors/reserved_identifier/index.html
index a483f4cd1a..a5bb87f6ba 100644
--- a/files/de/web/javascript/reference/errors/reserved_identifier/index.html
+++ b/files/de/web/javascript/reference/errors/reserved_identifier/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'SyntaxError: "x" is a reserved identifier'
-slug: Web/JavaScript/Reference/Fehler/Reserved_identifier
+slug: Web/JavaScript/Reference/Errors/Reserved_identifier
 tags:
   - Error
   - Errors
   - JavaScript
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/Reserved_identifier
+original_slug: Web/JavaScript/Reference/Fehler/Reserved_identifier
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/resulting_string_too_large/index.html b/files/de/web/javascript/reference/errors/resulting_string_too_large/index.html
index e3f0246d13..d2c4235e61 100644
--- a/files/de/web/javascript/reference/errors/resulting_string_too_large/index.html
+++ b/files/de/web/javascript/reference/errors/resulting_string_too_large/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'RangeError: repeat count must be less than infinity'
-slug: Web/JavaScript/Reference/Fehler/Resulting_string_too_large
+slug: Web/JavaScript/Reference/Errors/Resulting_string_too_large
 tags:
   - Errors
   - JavaScript
   - RangeError
 translation_of: Web/JavaScript/Reference/Errors/Resulting_string_too_large
+original_slug: Web/JavaScript/Reference/Fehler/Resulting_string_too_large
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/stmt_after_return/index.html b/files/de/web/javascript/reference/errors/stmt_after_return/index.html
index be395c3b83..fc249d251a 100644
--- a/files/de/web/javascript/reference/errors/stmt_after_return/index.html
+++ b/files/de/web/javascript/reference/errors/stmt_after_return/index.html
@@ -1,10 +1,11 @@
 ---
 title: 'Warning: unreachable code after return statement'
-slug: Web/JavaScript/Reference/Fehler/Stmt_after_return
+slug: Web/JavaScript/Reference/Errors/Stmt_after_return
 tags:
   - JavaScript
   - Warning
 translation_of: Web/JavaScript/Reference/Errors/Stmt_after_return
+original_slug: Web/JavaScript/Reference/Fehler/Stmt_after_return
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/strict_non_simple_params/index.html b/files/de/web/javascript/reference/errors/strict_non_simple_params/index.html
index a288a81a10..285ae0b7e7 100644
--- a/files/de/web/javascript/reference/errors/strict_non_simple_params/index.html
+++ b/files/de/web/javascript/reference/errors/strict_non_simple_params/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'SyntaxError: "use strict" not allowed in function with non-simple parameters'
-slug: Web/JavaScript/Reference/Fehler/Strict_Non_Simple_Params
+slug: Web/JavaScript/Reference/Errors/Strict_Non_Simple_Params
 tags:
   - Errors
   - JavaScript
   - TypeError
 translation_of: Web/JavaScript/Reference/Errors/Strict_Non_Simple_Params
+original_slug: Web/JavaScript/Reference/Fehler/Strict_Non_Simple_Params
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/too_much_recursion/index.html b/files/de/web/javascript/reference/errors/too_much_recursion/index.html
index 0010afd90a..642af53a47 100644
--- a/files/de/web/javascript/reference/errors/too_much_recursion/index.html
+++ b/files/de/web/javascript/reference/errors/too_much_recursion/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'InternalError: too much recursion'
-slug: Web/JavaScript/Reference/Fehler/Too_much_recursion
+slug: Web/JavaScript/Reference/Errors/Too_much_recursion
 tags:
   - Errors
   - InternalError
   - JavaScript
 translation_of: Web/JavaScript/Reference/Errors/Too_much_recursion
+original_slug: Web/JavaScript/Reference/Fehler/Too_much_recursion
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/typed_array_invalid_arguments/index.html b/files/de/web/javascript/reference/errors/typed_array_invalid_arguments/index.html
index 2e7fa8f0b3..b6621776e6 100644
--- a/files/de/web/javascript/reference/errors/typed_array_invalid_arguments/index.html
+++ b/files/de/web/javascript/reference/errors/typed_array_invalid_arguments/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'TypeError: invalid arguments'
-slug: Web/JavaScript/Reference/Fehler/Typed_array_invalid_arguments
+slug: Web/JavaScript/Reference/Errors/Typed_array_invalid_arguments
 tags:
   - Error
   - Errors
   - JavaScript
   - TypeError
 translation_of: Web/JavaScript/Reference/Errors/Typed_array_invalid_arguments
+original_slug: Web/JavaScript/Reference/Fehler/Typed_array_invalid_arguments
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/undeclared_var/index.html b/files/de/web/javascript/reference/errors/undeclared_var/index.html
index b7c8b09165..3a981a006d 100644
--- a/files/de/web/javascript/reference/errors/undeclared_var/index.html
+++ b/files/de/web/javascript/reference/errors/undeclared_var/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'ReferenceError: assignment to undeclared variable "x"'
-slug: Web/JavaScript/Reference/Fehler/Undeclared_var
+slug: Web/JavaScript/Reference/Errors/Undeclared_var
 tags:
   - Errors
   - JavaScript
   - ReferenceError
   - Strict Mode
 translation_of: Web/JavaScript/Reference/Errors/Undeclared_var
+original_slug: Web/JavaScript/Reference/Fehler/Undeclared_var
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/undefined_prop/index.html b/files/de/web/javascript/reference/errors/undefined_prop/index.html
index fe83564f59..9e63feb77b 100644
--- a/files/de/web/javascript/reference/errors/undefined_prop/index.html
+++ b/files/de/web/javascript/reference/errors/undefined_prop/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'ReferenceError: reference to undefined property "x"'
-slug: Web/JavaScript/Reference/Fehler/Undefined_prop
+slug: Web/JavaScript/Reference/Errors/Undefined_prop
 tags:
   - Errors
   - JavaScript
   - ReferenceError
   - Strict Mode
 translation_of: Web/JavaScript/Reference/Errors/Undefined_prop
+original_slug: Web/JavaScript/Reference/Fehler/Undefined_prop
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/unexpected_token/index.html b/files/de/web/javascript/reference/errors/unexpected_token/index.html
index 3aff253bfd..6d02ff499d 100644
--- a/files/de/web/javascript/reference/errors/unexpected_token/index.html
+++ b/files/de/web/javascript/reference/errors/unexpected_token/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'SyntaxError: Unexpected token'
-slug: Web/JavaScript/Reference/Fehler/Unexpected_token
+slug: Web/JavaScript/Reference/Errors/Unexpected_token
 tags:
   - Fehler
   - JavaScript
   - Syntaxfehler
 translation_of: Web/JavaScript/Reference/Errors/Unexpected_token
+original_slug: Web/JavaScript/Reference/Fehler/Unexpected_token
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/unexpected_type/index.html b/files/de/web/javascript/reference/errors/unexpected_type/index.html
index 601ec21d43..dccd1b4b6c 100644
--- a/files/de/web/javascript/reference/errors/unexpected_type/index.html
+++ b/files/de/web/javascript/reference/errors/unexpected_type/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'TypeError: "x" is (not) "y"'
-slug: Web/JavaScript/Reference/Fehler/Unexpected_type
+slug: Web/JavaScript/Reference/Errors/Unexpected_type
 tags:
   - Errors
   - JavaScript
   - TypeError
 translation_of: Web/JavaScript/Reference/Errors/Unexpected_type
+original_slug: Web/JavaScript/Reference/Fehler/Unexpected_type
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/unnamed_function_statement/index.html b/files/de/web/javascript/reference/errors/unnamed_function_statement/index.html
index 6c148b6ff0..3ceee9d473 100644
--- a/files/de/web/javascript/reference/errors/unnamed_function_statement/index.html
+++ b/files/de/web/javascript/reference/errors/unnamed_function_statement/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'SyntaxError: function statement requires a name'
-slug: Web/JavaScript/Reference/Fehler/Unnamed_function_statement
+slug: Web/JavaScript/Reference/Errors/Unnamed_function_statement
 tags:
   - Error
   - Errors
   - JavaScript
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/Unnamed_function_statement
+original_slug: Web/JavaScript/Reference/Fehler/Unnamed_function_statement
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/unterminated_string_literal/index.html b/files/de/web/javascript/reference/errors/unterminated_string_literal/index.html
index 3d60240b51..7a03b23ea1 100644
--- a/files/de/web/javascript/reference/errors/unterminated_string_literal/index.html
+++ b/files/de/web/javascript/reference/errors/unterminated_string_literal/index.html
@@ -1,11 +1,12 @@
 ---
 title: 'SyntaxError: unterminated string literal'
-slug: Web/JavaScript/Reference/Fehler/Unterminated_string_literal
+slug: Web/JavaScript/Reference/Errors/Unterminated_string_literal
 tags:
   - Errors
   - JavaScript
   - SyntaxError
 translation_of: Web/JavaScript/Reference/Errors/Unterminated_string_literal
+original_slug: Web/JavaScript/Reference/Fehler/Unterminated_string_literal
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/errors/var_hides_argument/index.html b/files/de/web/javascript/reference/errors/var_hides_argument/index.html
index f06a1d5220..b1c84be1d1 100644
--- a/files/de/web/javascript/reference/errors/var_hides_argument/index.html
+++ b/files/de/web/javascript/reference/errors/var_hides_argument/index.html
@@ -1,12 +1,13 @@
 ---
 title: 'TypeError: variable "x" redeclares argument'
-slug: Web/JavaScript/Reference/Fehler/Var_hides_argument
+slug: Web/JavaScript/Reference/Errors/Var_hides_argument
 tags:
   - Errors
   - JavaScript
   - Strict Mode
   - TypeError
 translation_of: Web/JavaScript/Reference/Errors/Var_hides_argument
+original_slug: Web/JavaScript/Reference/Fehler/Var_hides_argument
 ---
 <div>{{jsSidebar("Errors")}}</div>
 
diff --git a/files/de/web/javascript/reference/functions/arrow_functions/index.html b/files/de/web/javascript/reference/functions/arrow_functions/index.html
index a29b5ea3cf..1304e9edda 100644
--- a/files/de/web/javascript/reference/functions/arrow_functions/index.html
+++ b/files/de/web/javascript/reference/functions/arrow_functions/index.html
@@ -1,6 +1,6 @@
 ---
 title: Pfeilfunktionen
-slug: Web/JavaScript/Reference/Functions/Pfeilfunktionen
+slug: Web/JavaScript/Reference/Functions/Arrow_functions
 tags:
   - ECMAScript 2015
   - Functions
@@ -8,6 +8,7 @@ tags:
   - JavaScript
   - Reference
 translation_of: Web/JavaScript/Reference/Functions/Arrow_functions
+original_slug: Web/JavaScript/Reference/Functions/Pfeilfunktionen
 ---
 <div>{{jsSidebar("Functions")}}</div>
 
diff --git a/files/de/web/javascript/reference/functions/method_definitions/index.html b/files/de/web/javascript/reference/functions/method_definitions/index.html
index bf4d432627..10d1cd5f78 100644
--- a/files/de/web/javascript/reference/functions/method_definitions/index.html
+++ b/files/de/web/javascript/reference/functions/method_definitions/index.html
@@ -1,6 +1,6 @@
 ---
 title: Methoden Definitionen
-slug: Web/JavaScript/Reference/Functions/Methoden_Definitionen
+slug: Web/JavaScript/Reference/Functions/Method_definitions
 tags:
   - ECMAScript 2015
   - Funktionen
@@ -8,6 +8,7 @@ tags:
   - Objekte
   - Syntax
 translation_of: Web/JavaScript/Reference/Functions/Method_definitions
+original_slug: Web/JavaScript/Reference/Functions/Methoden_Definitionen
 ---
 <div>{{JsSidebar("Functions")}}</div>
 
diff --git a/files/de/web/javascript/reference/functions/rest_parameters/index.html b/files/de/web/javascript/reference/functions/rest_parameters/index.html
index a529c7b1d6..b07d429542 100644
--- a/files/de/web/javascript/reference/functions/rest_parameters/index.html
+++ b/files/de/web/javascript/reference/functions/rest_parameters/index.html
@@ -1,12 +1,13 @@
 ---
 title: Rest Parameter
-slug: Web/JavaScript/Reference/Functions/rest_parameter
+slug: Web/JavaScript/Reference/Functions/rest_parameters
 tags:
   - Functions
   - JavaScript
   - Rest
   - Rest Parameter
 translation_of: Web/JavaScript/Reference/Functions/rest_parameters
+original_slug: Web/JavaScript/Reference/Functions/rest_parameter
 ---
 <div>{{jsSidebar("Functions")}}</div>
 
diff --git a/files/de/web/javascript/reference/global_objects/atomics/notify/index.html b/files/de/web/javascript/reference/global_objects/atomics/notify/index.html
index 5ac06d7adc..1a88be7587 100644
--- a/files/de/web/javascript/reference/global_objects/atomics/notify/index.html
+++ b/files/de/web/javascript/reference/global_objects/atomics/notify/index.html
@@ -1,12 +1,13 @@
 ---
 title: Atomics.notify()
-slug: Web/JavaScript/Reference/Global_Objects/Atomics/wake
+slug: Web/JavaScript/Reference/Global_Objects/Atomics/notify
 tags:
   - Atomics
   - JavaScript
   - Method
   - Shared Memory
 translation_of: Web/JavaScript/Reference/Global_Objects/Atomics/notify
+original_slug: Web/JavaScript/Reference/Global_Objects/Atomics/wake
 ---
 <div>{{JSRef}}</div>
 
diff --git a/files/de/web/javascript/reference/global_objects/math/random/index.html b/files/de/web/javascript/reference/global_objects/math/random/index.html
index 6097229c1a..c57bb9f1c8 100644
--- a/files/de/web/javascript/reference/global_objects/math/random/index.html
+++ b/files/de/web/javascript/reference/global_objects/math/random/index.html
@@ -1,12 +1,13 @@
 ---
 title: Math.random()
-slug: Web/JavaScript/Reference/Global_Objects/Math/math.random
+slug: Web/JavaScript/Reference/Global_Objects/Math/random
 tags:
   - JavaScript
   - Math
   - Method
   - Reference
 translation_of: Web/JavaScript/Reference/Global_Objects/Math/random
+original_slug: Web/JavaScript/Reference/Global_Objects/Math/math.random
 ---
 <div>{{JSRef}}</div>
 
diff --git a/files/de/web/javascript/reference/global_objects/string/search/index.html b/files/de/web/javascript/reference/global_objects/string/search/index.html
index 5fb838010a..c1d0af6731 100644
--- a/files/de/web/javascript/reference/global_objects/string/search/index.html
+++ b/files/de/web/javascript/reference/global_objects/string/search/index.html
@@ -1,6 +1,6 @@
 ---
 title: String.prototype.search()
-slug: Web/JavaScript/Reference/Global_Objects/String/suchen
+slug: Web/JavaScript/Reference/Global_Objects/String/search
 tags:
   - JavaScript
   - Méthode
@@ -9,6 +9,7 @@ tags:
   - Regulärer Ausdruck
   - Zeichenkette
 translation_of: Web/JavaScript/Reference/Global_Objects/String/search
+original_slug: Web/JavaScript/Reference/Global_Objects/String/suchen
 ---
 <div>{{JSRef}}</div>
 
diff --git a/files/de/web/javascript/reference/global_objects/string/trimend/index.html b/files/de/web/javascript/reference/global_objects/string/trimend/index.html
index b66e15f474..161137e75e 100644
--- a/files/de/web/javascript/reference/global_objects/string/trimend/index.html
+++ b/files/de/web/javascript/reference/global_objects/string/trimend/index.html
@@ -1,6 +1,6 @@
 ---
 title: String.prototype.trimRight()
-slug: Web/JavaScript/Reference/Global_Objects/String/TrimRight
+slug: Web/JavaScript/Reference/Global_Objects/String/trimEnd
 tags:
   - JavaScript
   - Method
@@ -8,6 +8,7 @@ tags:
   - Reference
   - String
 translation_of: Web/JavaScript/Reference/Global_Objects/String/trimEnd
+original_slug: Web/JavaScript/Reference/Global_Objects/String/TrimRight
 ---
 <div>{{JSRef}} {{non-standard_header}}</div>
 
diff --git a/files/de/web/javascript/reference/global_objects/string/trimstart/index.html b/files/de/web/javascript/reference/global_objects/string/trimstart/index.html
index db5dbd55cb..00d06919eb 100644
--- a/files/de/web/javascript/reference/global_objects/string/trimstart/index.html
+++ b/files/de/web/javascript/reference/global_objects/string/trimstart/index.html
@@ -1,6 +1,6 @@
 ---
 title: String.prototype.trimLeft()
-slug: Web/JavaScript/Reference/Global_Objects/String/TrimLeft
+slug: Web/JavaScript/Reference/Global_Objects/String/trimStart
 tags:
   - JavaScript
   - Method
@@ -8,6 +8,7 @@ tags:
   - Reference
   - String
 translation_of: Web/JavaScript/Reference/Global_Objects/String/trimStart
+original_slug: Web/JavaScript/Reference/Global_Objects/String/TrimLeft
 ---
 <div>{{JSRef}} {{non-standard_header}}</div>
 
diff --git a/files/de/web/javascript/reference/operators/decrement/index.html b/files/de/web/javascript/reference/operators/decrement/index.html
index 16b185b35c..c425107a8d 100644
--- a/files/de/web/javascript/reference/operators/decrement/index.html
+++ b/files/de/web/javascript/reference/operators/decrement/index.html
@@ -1,11 +1,12 @@
 ---
 title: Dekrement (--)
-slug: Web/JavaScript/Reference/Operators/Dekrement
+slug: Web/JavaScript/Reference/Operators/Decrement
 tags:
   - Dekrement
   - Dekrement-Operator
   - Dekrementieren
 translation_of: Web/JavaScript/Reference/Operators/Decrement
+original_slug: Web/JavaScript/Reference/Operators/Dekrement
 ---
 <div>{{jsSidebar("Operators")}}</div>
 
diff --git a/files/de/web/javascript/reference/operators/destructuring_assignment/index.html b/files/de/web/javascript/reference/operators/destructuring_assignment/index.html
index 1ece290e90..82a5d0ab5a 100644
--- a/files/de/web/javascript/reference/operators/destructuring_assignment/index.html
+++ b/files/de/web/javascript/reference/operators/destructuring_assignment/index.html
@@ -1,12 +1,13 @@
 ---
 title: Destrukturierende Zuweisung
-slug: Web/JavaScript/Reference/Operators/Destrukturierende_Zuweisung
+slug: Web/JavaScript/Reference/Operators/Destructuring_assignment
 tags:
   - Destructuring
   - ECMAScript 2015
   - JavaScript
   - Operator
 translation_of: Web/JavaScript/Reference/Operators/Destructuring_assignment
+original_slug: Web/JavaScript/Reference/Operators/Destrukturierende_Zuweisung
 ---
 <div>{{jsSidebar("Operators")}}</div>
 
diff --git a/files/de/web/javascript/reference/operators/increment/index.html b/files/de/web/javascript/reference/operators/increment/index.html
index 74289b92e1..f47037708f 100644
--- a/files/de/web/javascript/reference/operators/increment/index.html
+++ b/files/de/web/javascript/reference/operators/increment/index.html
@@ -1,11 +1,12 @@
 ---
 title: Inkrement (++)
-slug: Web/JavaScript/Reference/Operators/Inkrement
+slug: Web/JavaScript/Reference/Operators/Increment
 tags:
   - Inkrement
   - Inkrement-Operator
   - Inkrementieren
 translation_of: Web/JavaScript/Reference/Operators/Increment
+original_slug: Web/JavaScript/Reference/Operators/Inkrement
 ---
 <div>{{jsSidebar("Operators")}}</div>
 
diff --git a/files/de/web/javascript/reference/operators/object_initializer/index.html b/files/de/web/javascript/reference/operators/object_initializer/index.html
index 32c30b7f16..b4ac1fb413 100644
--- a/files/de/web/javascript/reference/operators/object_initializer/index.html
+++ b/files/de/web/javascript/reference/operators/object_initializer/index.html
@@ -1,6 +1,6 @@
 ---
 title: Objekt Initialisierer
-slug: Web/JavaScript/Reference/Operators/Objekt_Initialisierer
+slug: Web/JavaScript/Reference/Operators/Object_initializer
 tags:
   - ECMAScript 2015
   - JSON
@@ -13,6 +13,7 @@ tags:
   - mutation
   - properties
 translation_of: Web/JavaScript/Reference/Operators/Object_initializer
+original_slug: Web/JavaScript/Reference/Operators/Objekt_Initialisierer
 ---
 <div>{{JsSidebar("Operators")}}</div>
 
diff --git a/files/de/web/javascript/reference/operators/optional_chaining/index.html b/files/de/web/javascript/reference/operators/optional_chaining/index.html
index 8ef763b3cd..84344c90ab 100644
--- a/files/de/web/javascript/reference/operators/optional_chaining/index.html
+++ b/files/de/web/javascript/reference/operators/optional_chaining/index.html
@@ -1,6 +1,6 @@
 ---
 title: Optionale Verkettung
-slug: Web/JavaScript/Reference/Operators/Optionale_Verkettung
+slug: Web/JavaScript/Reference/Operators/Optional_chaining
 tags:
   - Experimentell
   - JavaScript
@@ -9,6 +9,7 @@ tags:
   - Referenz
   - Verkettung
 translation_of: Web/JavaScript/Reference/Operators/Optional_chaining
+original_slug: Web/JavaScript/Reference/Operators/Optionale_Verkettung
 ---
 <div>{{JSSidebar("Operators")}}</div>
 
diff --git a/files/de/web/javascript/reference/operators/remainder/index.html b/files/de/web/javascript/reference/operators/remainder/index.html
index 19403ab883..36aacbfa93 100644
--- a/files/de/web/javascript/reference/operators/remainder/index.html
+++ b/files/de/web/javascript/reference/operators/remainder/index.html
@@ -1,12 +1,13 @@
 ---
 title: Modulo (%)
-slug: Web/JavaScript/Reference/Operators/Modulo
+slug: Web/JavaScript/Reference/Operators/Remainder
 tags:
   - Division mit Rest
   - Divisionsalgorithmus
   - Restwert
   - Restwertberechnung
 translation_of: Web/JavaScript/Reference/Operators/Remainder
+original_slug: Web/JavaScript/Reference/Operators/Modulo
 ---
 <div>{{jsSidebar("Operators")}}</div>
 
diff --git a/files/de/web/javascript/reference/statements/function/index.html b/files/de/web/javascript/reference/statements/function/index.html
index 64a54347bc..552b88e695 100644
--- a/files/de/web/javascript/reference/statements/function/index.html
+++ b/files/de/web/javascript/reference/statements/function/index.html
@@ -1,7 +1,8 @@
 ---
 title: Funktion
-slug: Web/JavaScript/Reference/Statements/funktion
+slug: Web/JavaScript/Reference/Statements/function
 translation_of: Web/JavaScript/Reference/Statements/function
+original_slug: Web/JavaScript/Reference/Statements/funktion
 ---
 <div>{{jsSidebar("Statements")}}</div>
 
diff --git a/files/de/web/javascript/reference/template_literals/index.html b/files/de/web/javascript/reference/template_literals/index.html
index 54885ed5a3..6d53234144 100644
--- a/files/de/web/javascript/reference/template_literals/index.html
+++ b/files/de/web/javascript/reference/template_literals/index.html
@@ -1,7 +1,8 @@
 ---
 title: Template-Strings
-slug: Web/JavaScript/Reference/template_strings
+slug: Web/JavaScript/Reference/Template_literals
 translation_of: Web/JavaScript/Reference/Template_literals
+original_slug: Web/JavaScript/Reference/template_strings
 ---
 <div>{{JsSidebar("More")}}</div>