unslug es: modify

97 files changed, 207 insertions, 109 deletions

diff --git a/files/es/learn/accessibility/what_is_accessibility/index.html b/files/es/learn/accessibility/what_is_accessibility/index.html
index e92994e37c..3d9d8d2843 100644
--- a/files/es/learn/accessibility/what_is_accessibility/index.html
+++ b/files/es/learn/accessibility/what_is_accessibility/index.html
@@ -1,7 +1,8 @@
 ---
 title: ¿Qué es la accesibilidad?
-slug: Learn/Accessibility/Qué_es_la_accesibilidad
+slug: Learn/Accessibility/What_is_accessibility
 translation_of: Learn/Accessibility/What_is_accessibility
+original_slug: Learn/Accessibility/Qué_es_la_accesibilidad
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/common_questions/common_web_layouts/index.html b/files/es/learn/common_questions/common_web_layouts/index.html
index 7e05cbcaad..5c78b094cd 100644
--- a/files/es/learn/common_questions/common_web_layouts/index.html
+++ b/files/es/learn/common_questions/common_web_layouts/index.html
@@ -1,6 +1,6 @@
 ---
 title: ¿Qué contienen los diseños web comunes?
-slug: Learn/Common_questions/diseños_web_comunes
+slug: Learn/Common_questions/Common_web_layouts
 tags:
   - CSS
   - Común
@@ -9,6 +9,7 @@ tags:
   - HTML
   - Principiante
 translation_of: Learn/Common_questions/Common_web_layouts
+original_slug: Learn/Common_questions/diseños_web_comunes
 ---
 <div>{{IncludeSubnav("/en-US/Learn")}}</div>
 
diff --git a/files/es/learn/common_questions/how_much_does_it_cost/index.html b/files/es/learn/common_questions/how_much_does_it_cost/index.html
index aeffd72c64..1a6116151d 100644
--- a/files/es/learn/common_questions/how_much_does_it_cost/index.html
+++ b/files/es/learn/common_questions/how_much_does_it_cost/index.html
@@ -1,6 +1,6 @@
 ---
 title: ¿Cuánto cuesta hacer algo en la Web?
-slug: Learn/Common_questions/Cuanto_cuesta
+slug: Learn/Common_questions/How_much_does_it_cost
 tags:
   - Comenzando
   - Herramientas de desarrollo web
@@ -9,6 +9,7 @@ tags:
   - costo
   - hosting
 translation_of: Learn/Common_questions/How_much_does_it_cost
+original_slug: Learn/Common_questions/Cuanto_cuesta
 ---
 <div class="summary">
 <p>Dedicarse a la web no es tan barato como parece. En este artículo discutimos cuánto puedes tener que gastar, y por qué.</p>
diff --git a/files/es/learn/common_questions/using_github_pages/index.html b/files/es/learn/common_questions/using_github_pages/index.html
index 81a7138430..2c52f5ef79 100644
--- a/files/es/learn/common_questions/using_github_pages/index.html
+++ b/files/es/learn/common_questions/using_github_pages/index.html
@@ -1,7 +1,8 @@
 ---
 title: ¿Cómo se utiliza Github pages?
-slug: Learn/Using_Github_pages
+slug: Learn/Common_questions/Using_Github_pages
 translation_of: Learn/Common_questions/Using_Github_pages
+original_slug: Learn/Using_Github_pages
 ---
 <p class="summary"><a href="https://github.com/">GitHub</a> es un sitio "social coding". Te permite subir repositorios de código para almacenarlo en el <strong>sistema de control de versiones</strong> <a href="http://git-scm.com/">Git</a>. Tu puedes colaborar en proyectos de código, y el sistema es código abierto por defecto, lo que significa que cualquiera en el mundo puede encontrar tu código en GitHub, usarlo, aprender de el, y mejorarlo. ¡Tú puedes hacer eso con el código de otras personas tambien! Este artículo provee una guía básica para publicar contenido usando la característica gh-pages de Github.</p>
 
diff --git a/files/es/learn/common_questions/what_is_a_url/index.html b/files/es/learn/common_questions/what_is_a_url/index.html
index ef50be60ad..de5d24db8d 100644
--- a/files/es/learn/common_questions/what_is_a_url/index.html
+++ b/files/es/learn/common_questions/what_is_a_url/index.html
@@ -1,7 +1,8 @@
 ---
 title: ¿Qué es una URL?
-slug: Learn/Common_questions/Qué_es_una_URL
+slug: Learn/Common_questions/What_is_a_URL
 translation_of: Learn/Common_questions/What_is_a_URL
+original_slug: Learn/Common_questions/Qué_es_una_URL
 ---
 <div class="summary">
 <p>Este artículo habla sobre las Uniform Resource Locators (URLs), explicando qué son y cómo se estructuran.</p>
diff --git a/files/es/learn/common_questions/what_is_a_web_server/index.html b/files/es/learn/common_questions/what_is_a_web_server/index.html
index 4969677db6..a7ded29232 100644
--- a/files/es/learn/common_questions/what_is_a_web_server/index.html
+++ b/files/es/learn/common_questions/what_is_a_web_server/index.html
@@ -1,11 +1,12 @@
 ---
 title: Que es un servidor WEB?
-slug: Learn/Common_questions/Que_es_un_servidor_WEB
+slug: Learn/Common_questions/What_is_a_web_server
 tags:
   - Infraestructura
   - Principiante
   - necesitaEsquema
 translation_of: Learn/Common_questions/What_is_a_web_server
+original_slug: Learn/Common_questions/Que_es_un_servidor_WEB
 ---
 <div class="summary">
 <p>En este articulo veremos que son los servidores, cómo funcionan y por qué son importantes.</p>
diff --git a/files/es/learn/common_questions/what_software_do_i_need/index.html b/files/es/learn/common_questions/what_software_do_i_need/index.html
index 92687e7d13..d5ee07aac3 100644
--- a/files/es/learn/common_questions/what_software_do_i_need/index.html
+++ b/files/es/learn/common_questions/what_software_do_i_need/index.html
@@ -1,6 +1,6 @@
 ---
 title: ¿Qué software necesito para construir un sitio web?
-slug: Learn/Common_questions/Que_software_necesito
+slug: Learn/Common_questions/What_software_do_I_need
 tags:
   - Build a website
   - Building
@@ -8,6 +8,7 @@ tags:
   - Principiante
   - software
 translation_of: Learn/Common_questions/What_software_do_I_need
+original_slug: Learn/Common_questions/Que_software_necesito
 ---
 <div class="summary">
 <p>En este artículo se explican cuales componentes de software necesita para editar, cargar, o visualizar un sitio web. </p>
diff --git a/files/es/learn/css/building_blocks/backgrounds_and_borders/index.html b/files/es/learn/css/building_blocks/backgrounds_and_borders/index.html
index 0de93e1eb1..a44c392720 100644
--- a/files/es/learn/css/building_blocks/backgrounds_and_borders/index.html
+++ b/files/es/learn/css/building_blocks/backgrounds_and_borders/index.html
@@ -1,7 +1,8 @@
 ---
 title: Fondos y bordes
-slug: Learn/CSS/Building_blocks/Fondos_y_bordes
+slug: Learn/CSS/Building_blocks/Backgrounds_and_borders
 translation_of: Learn/CSS/Building_blocks/Backgrounds_and_borders
+original_slug: Learn/CSS/Building_blocks/Fondos_y_bordes
 ---
 <div>{{LearnSidebar}}{{PreviousMenuNext("Learn/CSS/Building_blocks/The_box_model", "Learn/CSS/Building_blocks/Handling_different_text_directions", "Learn/CSS/Building_blocks")}}</div>
 
diff --git a/files/es/learn/css/building_blocks/cascade_and_inheritance/index.html b/files/es/learn/css/building_blocks/cascade_and_inheritance/index.html
index 91a359181f..b90c7a9d1f 100644
--- a/files/es/learn/css/building_blocks/cascade_and_inheritance/index.html
+++ b/files/es/learn/css/building_blocks/cascade_and_inheritance/index.html
@@ -1,7 +1,8 @@
 ---
 title: Cascada y herencia
-slug: Learn/CSS/Building_blocks/Cascada_y_herencia
+slug: Learn/CSS/Building_blocks/Cascade_and_inheritance
 translation_of: Learn/CSS/Building_blocks/Cascade_and_inheritance
+original_slug: Learn/CSS/Building_blocks/Cascada_y_herencia
 ---
 <div>{{LearnSidebar}}{{NextMenu("Learn/CSS/Building_blocks/Selectors", "Learn/CSS/Building_blocks")}}</div>
 
diff --git a/files/es/learn/css/building_blocks/debugging_css/index.html b/files/es/learn/css/building_blocks/debugging_css/index.html
index 5f04fdd756..3e1b940897 100644
--- a/files/es/learn/css/building_blocks/debugging_css/index.html
+++ b/files/es/learn/css/building_blocks/debugging_css/index.html
@@ -1,7 +1,8 @@
 ---
 title: Depurar el CSS
-slug: Learn/CSS/Building_blocks/Depurar_el_CSS
+slug: Learn/CSS/Building_blocks/Debugging_CSS
 translation_of: Learn/CSS/Building_blocks/Debugging_CSS
+original_slug: Learn/CSS/Building_blocks/Depurar_el_CSS
 ---
 <div>{{LearnSidebar}}{{PreviousMenuNext("Learn/CSS/Building_blocks/Styling_tables", "Learn/CSS/Building_blocks/Organizing", "Learn/CSS/Building_blocks")}}</div>
 
diff --git a/files/es/learn/css/building_blocks/fundamental_css_comprehension/index.html b/files/es/learn/css/building_blocks/fundamental_css_comprehension/index.html
index b53db2df02..a4f90859a7 100644
--- a/files/es/learn/css/building_blocks/fundamental_css_comprehension/index.html
+++ b/files/es/learn/css/building_blocks/fundamental_css_comprehension/index.html
@@ -1,6 +1,6 @@
 ---
 title: Comprensión de los fundamentos de CSS
-slug: Learn/CSS/Introduction_to_CSS/Fundamental_CSS_comprehension
+slug: Learn/CSS/Building_blocks/Fundamental_CSS_comprehension
 tags:
   - CSS
   - Estilo
@@ -12,6 +12,7 @@ tags:
   - comentários
   - reglas
 translation_of: Learn/CSS/Building_blocks/Fundamental_CSS_comprehension
+original_slug: Learn/CSS/Introduction_to_CSS/Fundamental_CSS_comprehension
 ---
 <div class="boxed translate-rendered">
 <div>{{LearnSidebar}}</div>
diff --git a/files/es/learn/css/building_blocks/handling_different_text_directions/index.html b/files/es/learn/css/building_blocks/handling_different_text_directions/index.html
index fa21de66e5..4f1e9a7143 100644
--- a/files/es/learn/css/building_blocks/handling_different_text_directions/index.html
+++ b/files/es/learn/css/building_blocks/handling_different_text_directions/index.html
@@ -1,6 +1,6 @@
 ---
 title: Manejando diferentes direcciones de texto
-slug: Learn/CSS/Building_blocks/Manejando_diferentes_direcciones_de_texto
+slug: Learn/CSS/Building_blocks/Handling_different_text_directions
 tags:
   - Aprendizaje
   - CSS
@@ -10,6 +10,7 @@ tags:
   - Principiante
   - Propiedades lógicas
 translation_of: Learn/CSS/Building_blocks/Handling_different_text_directions
+original_slug: Learn/CSS/Building_blocks/Manejando_diferentes_direcciones_de_texto
 ---
 <div>{{LearnSidebar}}{{PreviousMenuNext("Learn/CSS/Building_blocks/Backgrounds_and_borders", "Learn/CSS/Building_blocks/Overflowing_content", "Learn/CSS/Building_blocks")}}</div>
 
diff --git a/files/es/learn/css/building_blocks/images_media_form_elements/index.html b/files/es/learn/css/building_blocks/images_media_form_elements/index.html
index db0f522728..27232582a5 100644
--- a/files/es/learn/css/building_blocks/images_media_form_elements/index.html
+++ b/files/es/learn/css/building_blocks/images_media_form_elements/index.html
@@ -1,7 +1,8 @@
 ---
-title: 'Imágenes, medios y elementos de formulario'
-slug: Learn/CSS/Building_blocks/Imágenes_medios_y_elementos_de_formulario
+title: Imágenes, medios y elementos de formulario
+slug: Learn/CSS/Building_blocks/Images_media_form_elements
 translation_of: Learn/CSS/Building_blocks/Images_media_form_elements
+original_slug: Learn/CSS/Building_blocks/Imágenes_medios_y_elementos_de_formulario
 ---
 <div>{{LearnSidebar}}{{PreviousMenuNext("Learn/CSS/Building_blocks/Sizing_items_in_CSS", "Learn/CSS/Building_blocks/Styling_tables", "Learn/CSS/Building_blocks")}}</div>
 
diff --git a/files/es/learn/css/building_blocks/overflowing_content/index.html b/files/es/learn/css/building_blocks/overflowing_content/index.html
index 808a519c12..4c5b173d08 100644
--- a/files/es/learn/css/building_blocks/overflowing_content/index.html
+++ b/files/es/learn/css/building_blocks/overflowing_content/index.html
@@ -1,7 +1,8 @@
 ---
 title: Contenido desbordado
-slug: Learn/CSS/Building_blocks/Contenido_desbordado
+slug: Learn/CSS/Building_blocks/Overflowing_content
 translation_of: Learn/CSS/Building_blocks/Overflowing_content
+original_slug: Learn/CSS/Building_blocks/Contenido_desbordado
 ---
 <div>{{LearnSidebar}}{{PreviousMenuNext("Learn/CSS/Building_blocks/Handling_different_text_directions", "Learn/CSS/Building_blocks/Values_and_units", "Learn/CSS/Building_blocks")}}</div>
 
diff --git a/files/es/learn/css/building_blocks/selectors/attribute_selectors/index.html b/files/es/learn/css/building_blocks/selectors/attribute_selectors/index.html
index 057c38c18d..fc106ec303 100644
--- a/files/es/learn/css/building_blocks/selectors/attribute_selectors/index.html
+++ b/files/es/learn/css/building_blocks/selectors/attribute_selectors/index.html
@@ -1,7 +1,8 @@
 ---
 title: Selectores de atributo
-slug: Learn/CSS/Building_blocks/Selectores_CSS/Selectores_de_atributos
+slug: Learn/CSS/Building_blocks/Selectors/Attribute_selectors
 translation_of: Learn/CSS/Building_blocks/Selectors/Attribute_selectors
+original_slug: Learn/CSS/Building_blocks/Selectores_CSS/Selectores_de_atributos
 ---
 <p>{{LearnSidebar}}{{PreviousMenuNext("Learn/CSS/Building_blocks/Selectors/Type_Class_and_ID_Selectors", "Learn/CSS/Building_blocks/Selectors/Pseudo-classes_and_pseudo-elements", "Learn/CSS/Building_blocks")}}</p>
 
diff --git a/files/es/learn/css/building_blocks/selectors/combinators/index.html b/files/es/learn/css/building_blocks/selectors/combinators/index.html
index 54f416456d..b6c2f0a5bf 100644
--- a/files/es/learn/css/building_blocks/selectors/combinators/index.html
+++ b/files/es/learn/css/building_blocks/selectors/combinators/index.html
@@ -1,7 +1,8 @@
 ---
 title: Combinadores
-slug: Learn/CSS/Building_blocks/Selectores_CSS/Combinadores
+slug: Learn/CSS/Building_blocks/Selectors/Combinators
 translation_of: Learn/CSS/Building_blocks/Selectors/Combinators
+original_slug: Learn/CSS/Building_blocks/Selectores_CSS/Combinadores
 ---
 <p>{{LearnSidebar}}{{PreviousMenuNext("Learn/CSS/Building_blocks/Selectors/Pseudo-classes_and_pseudo-elements", "Learn/CSS/Building_blocks/The_box_model", "Learn/CSS/Building_blocks")}}</p>
 
diff --git a/files/es/learn/css/building_blocks/selectors/index.html b/files/es/learn/css/building_blocks/selectors/index.html
index d0ea61da20..4584bb30d3 100644
--- a/files/es/learn/css/building_blocks/selectors/index.html
+++ b/files/es/learn/css/building_blocks/selectors/index.html
@@ -1,7 +1,8 @@
 ---
 title: Selectores CSS
-slug: Learn/CSS/Building_blocks/Selectores_CSS
+slug: Learn/CSS/Building_blocks/Selectors
 translation_of: Learn/CSS/Building_blocks/Selectors
+original_slug: Learn/CSS/Building_blocks/Selectores_CSS
 ---
 <div>{{LearnSidebar}}{{PreviousMenuNext("Learn/CSS/Building_blocks/Cascade_and_inheritance", "Learn/CSS/Building_blocks/Selectors/Type_Class_and_ID_Selectors", "Learn/CSS/Building_blocks")}}</div>
 
diff --git a/files/es/learn/css/building_blocks/selectors/pseudo-classes_and_pseudo-elements/index.html b/files/es/learn/css/building_blocks/selectors/pseudo-classes_and_pseudo-elements/index.html
index f48dfdcbd5..6cba271113 100644
--- a/files/es/learn/css/building_blocks/selectors/pseudo-classes_and_pseudo-elements/index.html
+++ b/files/es/learn/css/building_blocks/selectors/pseudo-classes_and_pseudo-elements/index.html
@@ -1,7 +1,8 @@
 ---
 title: Pseudoclases y pseudoelementos
-slug: Learn/CSS/Building_blocks/Selectores_CSS/Pseudo-clases_y_pseudo-elementos
+slug: Learn/CSS/Building_blocks/Selectors/Pseudo-classes_and_pseudo-elements
 translation_of: Learn/CSS/Building_blocks/Selectors/Pseudo-classes_and_pseudo-elements
+original_slug: Learn/CSS/Building_blocks/Selectores_CSS/Pseudo-clases_y_pseudo-elementos
 ---
 <p>{{LearnSidebar}}{{PreviousMenuNext("Learn/CSS/Building_blocks/Selectors/Attribute_selectors", "Learn/CSS/Building_blocks/Selectors/Combinators", "Learn/CSS/Building_blocks")}}</p>
 
diff --git a/files/es/learn/css/building_blocks/selectors/type_class_and_id_selectors/index.html b/files/es/learn/css/building_blocks/selectors/type_class_and_id_selectors/index.html
index 01b3963f8a..c4e6758ca2 100644
--- a/files/es/learn/css/building_blocks/selectors/type_class_and_id_selectors/index.html
+++ b/files/es/learn/css/building_blocks/selectors/type_class_and_id_selectors/index.html
@@ -1,7 +1,8 @@
 ---
-title: 'Selectores de tipo, clase e ID'
-slug: Learn/CSS/Building_blocks/Selectores_CSS/Selectores_de_tipo_clase_e_ID
+title: Selectores de tipo, clase e ID
+slug: Learn/CSS/Building_blocks/Selectors/Type_Class_and_ID_Selectors
 translation_of: Learn/CSS/Building_blocks/Selectors/Type_Class_and_ID_Selectors
+original_slug: Learn/CSS/Building_blocks/Selectores_CSS/Selectores_de_tipo_clase_e_ID
 ---
 <p>{{LearnSidebar}}{{PreviousMenuNext("Learn/CSS/Building_blocks/Selectors", "Learn/CSS/Building_blocks/Selectors/Attribute_selectors", "Learn/CSS/Building_blocks")}}</p>
 
diff --git a/files/es/learn/css/building_blocks/sizing_items_in_css/index.html b/files/es/learn/css/building_blocks/sizing_items_in_css/index.html
index 81759abccc..4577a3a34a 100644
--- a/files/es/learn/css/building_blocks/sizing_items_in_css/index.html
+++ b/files/es/learn/css/building_blocks/sizing_items_in_css/index.html
@@ -1,7 +1,8 @@
 ---
 title: Dimensionar elementos en CSS
-slug: Learn/CSS/Building_blocks/Dimensionar_elementos_en_CSS
+slug: Learn/CSS/Building_blocks/Sizing_items_in_CSS
 translation_of: Learn/CSS/Building_blocks/Sizing_items_in_CSS
+original_slug: Learn/CSS/Building_blocks/Dimensionar_elementos_en_CSS
 ---
 <div>{{LearnSidebar}}{{PreviousMenuNext("Learn/CSS/Building_blocks/Values_and_units", "Learn/CSS/Building_blocks/Images_media_form_elements", "Learn/CSS/Building_blocks")}}</div>
 
diff --git a/files/es/learn/css/building_blocks/the_box_model/index.html b/files/es/learn/css/building_blocks/the_box_model/index.html
index dbc0d644f8..d0b81d69fe 100644
--- a/files/es/learn/css/building_blocks/the_box_model/index.html
+++ b/files/es/learn/css/building_blocks/the_box_model/index.html
@@ -1,7 +1,8 @@
 ---
 title: El modelo de caja
-slug: Learn/CSS/Building_blocks/El_modelo_de_caja
+slug: Learn/CSS/Building_blocks/The_box_model
 translation_of: Learn/CSS/Building_blocks/The_box_model
+original_slug: Learn/CSS/Building_blocks/El_modelo_de_caja
 ---
 <div>{{LearnSidebar}}{{PreviousMenuNext("Learn/CSS/Building_blocks/Selectors/Combinators", "Learn/CSS/Building_blocks/Backgrounds_and_borders", "Learn/CSS/Building_blocks")}}</div>
 
diff --git a/files/es/learn/css/building_blocks/values_and_units/index.html b/files/es/learn/css/building_blocks/values_and_units/index.html
index 4470746bc8..c72e131a90 100644
--- a/files/es/learn/css/building_blocks/values_and_units/index.html
+++ b/files/es/learn/css/building_blocks/values_and_units/index.html
@@ -1,7 +1,8 @@
 ---
 title: Valores y unidades CSS
-slug: Learn/CSS/Building_blocks/Valores_y_unidades_CSS
+slug: Learn/CSS/Building_blocks/Values_and_units
 translation_of: Learn/CSS/Building_blocks/Values_and_units
+original_slug: Learn/CSS/Building_blocks/Valores_y_unidades_CSS
 ---
 <div>{{LearnSidebar}}{{PreviousMenuNext("Learn/CSS/Building_blocks/Overflowing_content", "Learn/CSS/Building_blocks/Sizing_items_in_CSS", "Learn/CSS/Building_blocks")}}</div>
 
diff --git a/files/es/learn/css/css_layout/introduction/index.html b/files/es/learn/css/css_layout/introduction/index.html
index 2f409d97c3..769cd9da0f 100644
--- a/files/es/learn/css/css_layout/introduction/index.html
+++ b/files/es/learn/css/css_layout/introduction/index.html
@@ -1,7 +1,8 @@
 ---
 title: Introducción al diseño en CSS
-slug: Learn/CSS/CSS_layout/Introducción
+slug: Learn/CSS/CSS_layout/Introduction
 translation_of: Learn/CSS/CSS_layout/Introduction
+original_slug: Learn/CSS/CSS_layout/Introducción
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/css/css_layout/normal_flow/index.html b/files/es/learn/css/css_layout/normal_flow/index.html
index ffc873938f..6c528855af 100644
--- a/files/es/learn/css/css_layout/normal_flow/index.html
+++ b/files/es/learn/css/css_layout/normal_flow/index.html
@@ -1,7 +1,8 @@
 ---
 title: Flujo normal
-slug: Learn/CSS/CSS_layout/Flujo_normal
+slug: Learn/CSS/CSS_layout/Normal_Flow
 translation_of: Learn/CSS/CSS_layout/Normal_Flow
+original_slug: Learn/CSS/CSS_layout/Flujo_normal
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/css/css_layout/responsive_design/index.html b/files/es/learn/css/css_layout/responsive_design/index.html
index 4ddb7a94db..e1307d54a5 100644
--- a/files/es/learn/css/css_layout/responsive_design/index.html
+++ b/files/es/learn/css/css_layout/responsive_design/index.html
@@ -1,7 +1,8 @@
 ---
 title: Diseño receptivo
-slug: Learn/CSS/CSS_layout/Diseño_receptivo
+slug: Learn/CSS/CSS_layout/Responsive_Design
 translation_of: Learn/CSS/CSS_layout/Responsive_Design
+original_slug: Learn/CSS/CSS_layout/Diseño_receptivo
 ---
 <div>{{learnsidebar}}{{PreviousMenuNext("Learn/CSS/CSS_layout/Multiple-column_Layout", "Learn/CSS/CSS_layout/Media_queries", "Learn/CSS/CSS_layout")}}</div>
 
diff --git a/files/es/learn/css/css_layout/supporting_older_browsers/index.html b/files/es/learn/css/css_layout/supporting_older_browsers/index.html
index 18065a1da5..d709a628d5 100644
--- a/files/es/learn/css/css_layout/supporting_older_browsers/index.html
+++ b/files/es/learn/css/css_layout/supporting_older_browsers/index.html
@@ -1,7 +1,8 @@
 ---
 title: Soporte a navegadores antiguos
-slug: Learn/CSS/CSS_layout/Soporte_a_navegadores_antiguos
+slug: Learn/CSS/CSS_layout/Supporting_Older_Browsers
 translation_of: Learn/CSS/CSS_layout/Supporting_Older_Browsers
+original_slug: Learn/CSS/CSS_layout/Soporte_a_navegadores_antiguos
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/css/first_steps/getting_started/index.html b/files/es/learn/css/first_steps/getting_started/index.html
index 1da9edb582..0fc4331abe 100644
--- a/files/es/learn/css/first_steps/getting_started/index.html
+++ b/files/es/learn/css/first_steps/getting_started/index.html
@@ -1,6 +1,6 @@
 ---
 title: Empezar con CSS
-slug: Learn/CSS/First_steps/Comenzando_CSS
+slug: Learn/CSS/First_steps/Getting_started
 tags:
   - Aprender
   - CSS
@@ -12,6 +12,7 @@ tags:
   - Selectores
   - Sintaxis
 translation_of: Learn/CSS/First_steps/Getting_started
+original_slug: Learn/CSS/First_steps/Comenzando_CSS
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/css/first_steps/how_css_is_structured/index.html b/files/es/learn/css/first_steps/how_css_is_structured/index.html
index a3e9bb94b8..4021804ce5 100644
--- a/files/es/learn/css/first_steps/how_css_is_structured/index.html
+++ b/files/es/learn/css/first_steps/how_css_is_structured/index.html
@@ -1,7 +1,8 @@
 ---
 title: Cómo se estructura el CSS
-slug: Learn/CSS/First_steps/Como_se_estructura_CSS
+slug: Learn/CSS/First_steps/How_CSS_is_structured
 translation_of: Learn/CSS/First_steps/How_CSS_is_structured
+original_slug: Learn/CSS/First_steps/Como_se_estructura_CSS
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/css/first_steps/how_css_works/index.html b/files/es/learn/css/first_steps/how_css_works/index.html
index 920212e080..74c3e7fc06 100644
--- a/files/es/learn/css/first_steps/how_css_works/index.html
+++ b/files/es/learn/css/first_steps/how_css_works/index.html
@@ -1,7 +1,8 @@
 ---
 title: Cómo funciona CSS
-slug: Learn/CSS/First_steps/Como_funciona_CSS
+slug: Learn/CSS/First_steps/How_CSS_works
 translation_of: Learn/CSS/First_steps/How_CSS_works
+original_slug: Learn/CSS/First_steps/Como_funciona_CSS
 ---
 <p>{{LearnSidebar}}<br>
  {{PreviousMenuNext("Learn/CSS/First_steps/How_CSS_is_structured", "Learn/CSS/First_steps/Using_your_new_knowledge", "Learn/CSS/First_steps")}}</p>
diff --git a/files/es/learn/css/first_steps/using_your_new_knowledge/index.html b/files/es/learn/css/first_steps/using_your_new_knowledge/index.html
index bff4f103bf..2fe00e7ce9 100644
--- a/files/es/learn/css/first_steps/using_your_new_knowledge/index.html
+++ b/files/es/learn/css/first_steps/using_your_new_knowledge/index.html
@@ -1,11 +1,12 @@
 ---
 title: Usa tu nuevo conocimiento
-slug: Learn/CSS/First_steps/Usa_tu_nuevo_conocimiento
+slug: Learn/CSS/First_steps/Using_your_new_knowledge
 tags:
   - Aprendizaje
   - CSS
   - Principiante
 translation_of: Learn/CSS/First_steps/Using_your_new_knowledge
+original_slug: Learn/CSS/First_steps/Usa_tu_nuevo_conocimiento
 ---
 <p>{{LearnSidebar}}{{PreviousMenu("Learn/CSS/First_steps/How_CSS_works", "Learn/CSS/First_steps")}}</p>
 
diff --git a/files/es/learn/css/first_steps/what_is_css/index.html b/files/es/learn/css/first_steps/what_is_css/index.html
index eb4f8e8a8a..82908677ec 100644
--- a/files/es/learn/css/first_steps/what_is_css/index.html
+++ b/files/es/learn/css/first_steps/what_is_css/index.html
@@ -1,6 +1,6 @@
 ---
 title: ¿Qué es el CSS?
-slug: Learn/CSS/First_steps/Qué_es_CSS
+slug: Learn/CSS/First_steps/What_is_CSS
 tags:
   - Beginner
   - CSS
@@ -10,6 +10,7 @@ tags:
   - Specifications
   - Syntax
 translation_of: Learn/CSS/First_steps/What_is_CSS
+original_slug: Learn/CSS/First_steps/Qué_es_CSS
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/css/howto/css_faq/index.html b/files/es/learn/css/howto/css_faq/index.html
index 36c2fa1317..3037ac68c8 100644
--- a/files/es/learn/css/howto/css_faq/index.html
+++ b/files/es/learn/css/howto/css_faq/index.html
@@ -1,10 +1,11 @@
 ---
 title: Preguntas frecuentes sobre CSS
-slug: Web/CSS/Preguntas_frecuentes_sobre_CSS
+slug: Learn/CSS/Howto/CSS_FAQ
 tags:
   - CSS
   - Proyecto MDC
 translation_of: Learn/CSS/Howto/CSS_FAQ
+original_slug: Web/CSS/Preguntas_frecuentes_sobre_CSS
 ---
 <h4 id="My_CSS_is_valid.2C_but_not_correctly_rendered" name="My_CSS_is_valid.2C_but_not_correctly_rendered"><span class="goog-gtc-unit" id="goog-gtc-unit-2"><span class="goog-gtc-translatable goog-gtc-from-human" dir="ltr">Mi CSS es válida, pero no se representa correctamente</span></span></h4>
 <p><span class="goog-gtc-unit" id="goog-gtc-unit-3"><span class="goog-gtc-translatable goog-gtc-from-human" dir="ltr" style="">Los navegadores utilizan la declaración <code>DOCTYPE</code> para elegir entre mostrar el documento usando un modo que sea más compatible con los estándares de la Web o mostrarlo con los fallos de los navegadores antiguos.</span></span> <span class="goog-gtc-unit" id="goog-gtc-unit-4"><span class="goog-gtc-translatable goog-gtc-from-human" dir="ltr" style="">El uso de una declaración <code>DOCTYPE</code> correcta y moderna al inicio del código HTML mejorará el cumplimiento de los estándares del navegador.</span></span></p>
diff --git a/files/es/learn/css/howto/generated_content/index.html b/files/es/learn/css/howto/generated_content/index.html
index 605e87f9e2..232c1c6e4d 100644
--- a/files/es/learn/css/howto/generated_content/index.html
+++ b/files/es/learn/css/howto/generated_content/index.html
@@ -1,6 +1,6 @@
 ---
 title: Usando CSS para generar contenido
-slug: Learn/CSS/Sábercomo/Generated_content
+slug: Learn/CSS/Howto/Generated_content
 tags:
   - CSS
   - Fundamentos
@@ -9,6 +9,7 @@ tags:
   - Web
   - graficos
 translation_of: Learn/CSS/Howto/Generated_content
+original_slug: Learn/CSS/Sábercomo/Generated_content
 ---
 <p>{{ CSSTutorialTOC() }}</p>
 
diff --git a/files/es/learn/css/howto/index.html b/files/es/learn/css/howto/index.html
index ffff1653c0..c3669d187f 100644
--- a/files/es/learn/css/howto/index.html
+++ b/files/es/learn/css/howto/index.html
@@ -1,7 +1,8 @@
 ---
 title: Usa CSS para resolver problemas comunes
-slug: Learn/CSS/Sábercomo
+slug: Learn/CSS/Howto
 translation_of: Learn/CSS/Howto
+original_slug: Learn/CSS/Sábercomo
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/css/styling_text/web_fonts/index.html b/files/es/learn/css/styling_text/web_fonts/index.html
index 7bfa162217..880307b419 100644
--- a/files/es/learn/css/styling_text/web_fonts/index.html
+++ b/files/es/learn/css/styling_text/web_fonts/index.html
@@ -1,7 +1,8 @@
 ---
 title: Fuentes web
-slug: Learn/CSS/Styling_text/Fuentes_web
+slug: Learn/CSS/Styling_text/Web_fonts
 translation_of: Learn/CSS/Styling_text/Web_fonts
+original_slug: Learn/CSS/Styling_text/Fuentes_web
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/forms/basic_native_form_controls/index.html b/files/es/learn/forms/basic_native_form_controls/index.html
index c8a2651837..74b5b08e46 100644
--- a/files/es/learn/forms/basic_native_form_controls/index.html
+++ b/files/es/learn/forms/basic_native_form_controls/index.html
@@ -1,7 +1,8 @@
 ---
 title: Controles de formulario originales
-slug: Learn/HTML/Forms/The_native_form_widgets
+slug: Learn/Forms/Basic_native_form_controls
 translation_of: Learn/Forms/Basic_native_form_controls
+original_slug: Learn/HTML/Forms/The_native_form_widgets
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/forms/form_validation/index.html b/files/es/learn/forms/form_validation/index.html
index e967b68973..c5a4d4f0dc 100644
--- a/files/es/learn/forms/form_validation/index.html
+++ b/files/es/learn/forms/form_validation/index.html
@@ -1,6 +1,6 @@
 ---
 title: Validación de formularios de datos
-slug: Learn/HTML/Forms/Validacion_formulario_datos
+slug: Learn/Forms/Form_validation
 tags:
   - Ejemplo
   - Guía
@@ -10,6 +10,7 @@ tags:
   - Web
   - formulários
 translation_of: Learn/Forms/Form_validation
+original_slug: Learn/HTML/Forms/Validacion_formulario_datos
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/forms/how_to_build_custom_form_controls/index.html b/files/es/learn/forms/how_to_build_custom_form_controls/index.html
index 73ae6e6590..1f83cf0ad0 100644
--- a/files/es/learn/forms/how_to_build_custom_form_controls/index.html
+++ b/files/es/learn/forms/how_to_build_custom_form_controls/index.html
@@ -1,7 +1,8 @@
 ---
 title: Cómo crear widgets de formularios personalizados
-slug: Learn/HTML/Forms/como_crear_widgets_de_formularios_personalizados
+slug: Learn/Forms/How_to_build_custom_form_controls
 translation_of: Learn/Forms/How_to_build_custom_form_controls
+original_slug: Learn/HTML/Forms/como_crear_widgets_de_formularios_personalizados
 ---
 <div>{{LearnSidebar}}{{PreviousMenuNext("Learn/HTML/Forms/Form_validation", "Learn/HTML/Forms/Sending_forms_through_JavaScript", "Learn/HTML/Forms")}}</div>
 
diff --git a/files/es/learn/forms/how_to_structure_a_web_form/index.html b/files/es/learn/forms/how_to_structure_a_web_form/index.html
index 45f58520d1..e2a1a8efa9 100644
--- a/files/es/learn/forms/how_to_structure_a_web_form/index.html
+++ b/files/es/learn/forms/how_to_structure_a_web_form/index.html
@@ -1,7 +1,8 @@
 ---
 title: Cómo estructurar un formulario HTML
-slug: Learn/HTML/Forms/How_to_structure_an_HTML_form
+slug: Learn/Forms/How_to_structure_a_web_form
 translation_of: Learn/Forms/How_to_structure_a_web_form
+original_slug: Learn/HTML/Forms/How_to_structure_an_HTML_form
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/forms/html5_input_types/index.html b/files/es/learn/forms/html5_input_types/index.html
index d463399e93..7c62230c33 100644
--- a/files/es/learn/forms/html5_input_types/index.html
+++ b/files/es/learn/forms/html5_input_types/index.html
@@ -1,7 +1,8 @@
 ---
 title: Tipos de input de HTML5
-slug: Learn/HTML/Forms/Tipos_input_HTML5
+slug: Learn/Forms/HTML5_input_types
 translation_of: Learn/Forms/HTML5_input_types
+original_slug: Learn/HTML/Forms/Tipos_input_HTML5
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/forms/index.html b/files/es/learn/forms/index.html
index a0e77ec827..6413d9490a 100644
--- a/files/es/learn/forms/index.html
+++ b/files/es/learn/forms/index.html
@@ -1,10 +1,11 @@
 ---
 title: Formularios en HTML5
-slug: HTML/HTML5/Forms_in_HTML5
+slug: Learn/Forms
 tags:
   - Forms
   - HTML
   - HTML5
+original_slug: HTML/HTML5/Forms_in_HTML5
 ---
 <p>{{ gecko_minversion_header("2") }}</p>
 
diff --git a/files/es/learn/forms/property_compatibility_table_for_form_controls/index.html b/files/es/learn/forms/property_compatibility_table_for_form_controls/index.html
index 115b5580fe..a5c7202d69 100644
--- a/files/es/learn/forms/property_compatibility_table_for_form_controls/index.html
+++ b/files/es/learn/forms/property_compatibility_table_for_form_controls/index.html
@@ -1,7 +1,8 @@
 ---
 title: Tabla de compatibilidad de propiedades CSS para controles de formulario
-slug: Learn/HTML/Forms/Property_compatibility_table_for_form_controls
+slug: Learn/Forms/Property_compatibility_table_for_form_controls
 translation_of: Learn/Forms/Property_compatibility_table_for_form_controls
+original_slug: Learn/HTML/Forms/Property_compatibility_table_for_form_controls
 ---
 <div>{{learnsidebar}}</div>
 
diff --git a/files/es/learn/forms/sending_and_retrieving_form_data/index.html b/files/es/learn/forms/sending_and_retrieving_form_data/index.html
index d6ca2161a4..03fc91a7f1 100644
--- a/files/es/learn/forms/sending_and_retrieving_form_data/index.html
+++ b/files/es/learn/forms/sending_and_retrieving_form_data/index.html
@@ -1,7 +1,8 @@
 ---
 title: Sending form data
-slug: Learn/HTML/Forms/Sending_and_retrieving_form_data
+slug: Learn/Forms/Sending_and_retrieving_form_data
 translation_of: Learn/Forms/Sending_and_retrieving_form_data
+original_slug: Learn/HTML/Forms/Sending_and_retrieving_form_data
 ---
 <div>{{LearnSidebar}} {{PreviousMenuNext("Aprende / HTML / Formularios / The_native_form_widgets", "Aprender / html / Formularios / Form_validation", "Aprender / html / Forms")}}</div>
 
diff --git a/files/es/learn/forms/styling_web_forms/index.html b/files/es/learn/forms/styling_web_forms/index.html
index 26b4173ee8..6af4b94bed 100644
--- a/files/es/learn/forms/styling_web_forms/index.html
+++ b/files/es/learn/forms/styling_web_forms/index.html
@@ -1,7 +1,8 @@
 ---
 title: Estilizando formularios HTML
-slug: Learn/HTML/Forms/Styling_HTML_forms
+slug: Learn/Forms/Styling_web_forms
 translation_of: Learn/Forms/Styling_web_forms
+original_slug: Learn/HTML/Forms/Styling_HTML_forms
 ---
 <p>En este artículo aprenderemos como utilizar <a href="/es/docs/Web/CSS">CSS</a> con formularios <a href="/es/docs/Web/HTML">HTML</a>  para hacerlos más atractivos. Aunque parezca extraño, esto es algo que puede llegar a ser complicado. Por razones históricas y técnicas, los widgets de formulario no suelen llevarse bien con CSS. Por este motivo, muchos desarrolladores prefieren <a href="https://developer.mozilla.org/en-US/docs/HTML/Forms/How_to_build_custom_form_widgets">construir sus propios widgets</a> para tener el control de su aspecto en vez de utilizar los nativos. De todas formas, con los modernos navegadores, los diseñadores web <span style="line-height: 23.3333339691162px;">cada vez</span><span style="line-height: 1.5;"> tienen  más control sobre el diseño de los elementos de formulario. Vamos a profundizar en esto.</span></p>
 
diff --git a/files/es/learn/forms/test_your_skills_colon__html5_controls/index.html b/files/es/learn/forms/test_your_skills_colon__html5_controls/index.html
index b73c8d4442..da67e807c8 100644
--- a/files/es/learn/forms/test_your_skills_colon__html5_controls/index.html
+++ b/files/es/learn/forms/test_your_skills_colon__html5_controls/index.html
@@ -1,13 +1,14 @@
 ---
 title: 'Prueba tus habilidades: controles HTML5'
-slug: 'Learn/HTML/Forms/Prueba_tus_habilidades:_controles_HTML5'
+slug: Learn/Forms/Test_your_skills:_HTML5_controls
 tags:
   - Aprendizaje
   - Evaluación
   - Formulário
   - HTML5
   - Principiante
-translation_of: 'Learn/Forms/Test_your_skills:_HTML5_controls'
+translation_of: Learn/Forms/Test_your_skills:_HTML5_controls
+original_slug: Learn/HTML/Forms/Prueba_tus_habilidades:_controles_HTML5
 ---
 <div>{{learnsidebar}}</div>
 
diff --git a/files/es/learn/forms/test_your_skills_colon__other_controls/index.html b/files/es/learn/forms/test_your_skills_colon__other_controls/index.html
index 1496025a8d..4e3e8a0c45 100644
--- a/files/es/learn/forms/test_your_skills_colon__other_controls/index.html
+++ b/files/es/learn/forms/test_your_skills_colon__other_controls/index.html
@@ -1,7 +1,8 @@
 ---
 title: 'Prueba tus habilidades: Otros controles'
-slug: 'Learn/HTML/Forms/Prueba_tus_habilidades:_Otros_controles'
-translation_of: 'Learn/Forms/Test_your_skills:_Other_controls'
+slug: Learn/Forms/Test_your_skills:_Other_controls
+translation_of: Learn/Forms/Test_your_skills:_Other_controls
+original_slug: Learn/HTML/Forms/Prueba_tus_habilidades:_Otros_controles
 ---
 <div>{{learnsidebar}}</div>
 
diff --git a/files/es/learn/forms/your_first_form/index.html b/files/es/learn/forms/your_first_form/index.html
index df9d73bc60..8f0d8fe7c9 100644
--- a/files/es/learn/forms/your_first_form/index.html
+++ b/files/es/learn/forms/your_first_form/index.html
@@ -1,6 +1,6 @@
 ---
 title: Mi primer formulario HTML
-slug: Learn/HTML/Forms/Your_first_HTML_form
+slug: Learn/Forms/Your_first_form
 tags:
   - Ejemplo
   - Guía
@@ -9,6 +9,7 @@ tags:
   - Web
   - formulários
 translation_of: Learn/Forms/Your_first_form
+original_slug: Learn/HTML/Forms/Your_first_HTML_form
 ---
 <div>{{LearnSidebar}}{{NextMenu("Learn/Forms/How_to_structure_a_web_form", "Learn/Forms")}}</div>
 
diff --git a/files/es/learn/front-end_web_developer/index.html b/files/es/learn/front-end_web_developer/index.html
index f58a9ad486..a6f82bb539 100644
--- a/files/es/learn/front-end_web_developer/index.html
+++ b/files/es/learn/front-end_web_developer/index.html
@@ -1,6 +1,6 @@
 ---
 title: Desarrollo web Front-end
-slug: Learn/Desarrollo_web_Front-end
+slug: Learn/Front-end_web_developer
 tags:
   - Aprender
   - CSS
@@ -14,6 +14,7 @@ tags:
   - Novato
   - Principiante
 translation_of: Learn/Front-end_web_developer
+original_slug: Learn/Desarrollo_web_Front-end
 ---
 <p>{{learnsidebar}}</p>
 
diff --git a/files/es/learn/getting_started_with_the_web/dealing_with_files/index.html b/files/es/learn/getting_started_with_the_web/dealing_with_files/index.html
index 0c7f8c4121..85ca42d01c 100644
--- a/files/es/learn/getting_started_with_the_web/dealing_with_files/index.html
+++ b/files/es/learn/getting_started_with_the_web/dealing_with_files/index.html
@@ -1,6 +1,6 @@
 ---
 title: Manejo de archivos
-slug: Learn/Getting_started_with_the_web/Manejando_los_archivos
+slug: Learn/Getting_started_with_the_web/Dealing_with_files
 tags:
   - Archivos
   - Guía
@@ -9,9 +9,10 @@ tags:
   - Principiante
   - Scripting
   - Sitios Web
-  - 'l10n:priority'
+  - l10n:priority
   - teorias
 translation_of: Learn/Getting_started_with_the_web/Dealing_with_files
+original_slug: Learn/Getting_started_with_the_web/Manejando_los_archivos
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/getting_started_with_the_web/how_the_web_works/index.html b/files/es/learn/getting_started_with_the_web/how_the_web_works/index.html
index 546baf0309..ccf641f1e4 100644
--- a/files/es/learn/getting_started_with_the_web/how_the_web_works/index.html
+++ b/files/es/learn/getting_started_with_the_web/how_the_web_works/index.html
@@ -1,6 +1,6 @@
 ---
 title: Cómo funciona la web
-slug: Learn/Getting_started_with_the_web/Cómo_funciona_la_Web
+slug: Learn/Getting_started_with_the_web/How_the_Web_works
 tags:
   - Cliente
   - DNS
@@ -14,6 +14,7 @@ tags:
   - TCP
   - Web
 translation_of: Learn/Getting_started_with_the_web/How_the_Web_works
+original_slug: Learn/Getting_started_with_the_web/Cómo_funciona_la_Web
 ---
 <div>{{LearnSidebar()}}</div>
 
diff --git a/files/es/learn/getting_started_with_the_web/installing_basic_software/index.html b/files/es/learn/getting_started_with_the_web/installing_basic_software/index.html
index 84ffdcf666..7569624eaf 100644
--- a/files/es/learn/getting_started_with_the_web/installing_basic_software/index.html
+++ b/files/es/learn/getting_started_with_the_web/installing_basic_software/index.html
@@ -1,6 +1,6 @@
 ---
 title: Instalación de software básico
-slug: Learn/Getting_started_with_the_web/Instalacion_de_software_basico
+slug: Learn/Getting_started_with_the_web/Installing_basic_software
 tags:
   - Aprender
   - Configuración
@@ -12,8 +12,9 @@ tags:
   - buscador
   - editor de textos
   - instalar
-  - 'l10n:priority'
+  - l10n:priority
 translation_of: Learn/Getting_started_with_the_web/Installing_basic_software
+original_slug: Learn/Getting_started_with_the_web/Instalacion_de_software_basico
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/getting_started_with_the_web/the_web_and_web_standards/index.html b/files/es/learn/getting_started_with_the_web/the_web_and_web_standards/index.html
index daf6e77d18..67d6dc92cb 100644
--- a/files/es/learn/getting_started_with_the_web/the_web_and_web_standards/index.html
+++ b/files/es/learn/getting_started_with_the_web/the_web_and_web_standards/index.html
@@ -1,6 +1,6 @@
 ---
 title: La web y los estándares web
-slug: Learn/Getting_started_with_the_web/La_web_y_los_estandares_web
+slug: Learn/Getting_started_with_the_web/The_web_and_web_standards
 tags:
   - Estándares web
   - Front-end
@@ -10,6 +10,7 @@ tags:
   - Web
   - aprende
 translation_of: Learn/Getting_started_with_the_web/The_web_and_web_standards
+original_slug: Learn/Getting_started_with_the_web/La_web_y_los_estandares_web
 ---
 <p dir="ltr">{{learnsidebar}}</p>
 
diff --git a/files/es/learn/html/howto/author_fast-loading_html_pages/index.html b/files/es/learn/html/howto/author_fast-loading_html_pages/index.html
index b44128e05d..221875140a 100644
--- a/files/es/learn/html/howto/author_fast-loading_html_pages/index.html
+++ b/files/es/learn/html/howto/author_fast-loading_html_pages/index.html
@@ -1,12 +1,13 @@
 ---
 title: Consejos para la creación de páginas HTML de carga rápida
-slug: Web/HTML/Consejos_para_la_creación_de_páginas_HTML_de_carga_rápida
+slug: Learn/HTML/Howto/Author_fast-loading_HTML_pages
 tags:
   - Consejos
   - HTML
   - Rapido
   - Tips
 translation_of: Learn/HTML/Howto/Author_fast-loading_HTML_pages
+original_slug: Web/HTML/Consejos_para_la_creación_de_páginas_HTML_de_carga_rápida
 ---
 <h2 id="Consejos_para_la_creación_de_páginas_HTML_de_carga_rápida">Consejos para la creación de páginas HTML de carga rápida</h2>
 
diff --git a/files/es/learn/html/howto/index.html b/files/es/learn/html/howto/index.html
index 095e5bc54e..4717432b11 100644
--- a/files/es/learn/html/howto/index.html
+++ b/files/es/learn/html/howto/index.html
@@ -1,10 +1,11 @@
 ---
 title: Solución de problemas comunes de HTML
-slug: Learn/HTML/como
+slug: Learn/HTML/Howto
 tags:
   - CodificacióndeSecuenciadeComandos
   - HTML
 translation_of: Learn/HTML/Howto
+original_slug: Learn/HTML/como
 ---
 <p>{{LearnSidebar}}</p>
 
diff --git a/files/es/learn/html/howto/use_data_attributes/index.html b/files/es/learn/html/howto/use_data_attributes/index.html
index 7629974833..711d56f256 100644
--- a/files/es/learn/html/howto/use_data_attributes/index.html
+++ b/files/es/learn/html/howto/use_data_attributes/index.html
@@ -1,7 +1,8 @@
 ---
 title: Uso de atributos de datos
-slug: Learn/HTML/como/Usando_atributos_de_datos
+slug: Learn/HTML/Howto/Use_data_attributes
 translation_of: Learn/HTML/Howto/Use_data_attributes
+original_slug: Learn/HTML/como/Usando_atributos_de_datos
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/html/introduction_to_html/advanced_text_formatting/index.html b/files/es/learn/html/introduction_to_html/advanced_text_formatting/index.html
index 7e96d3c6d7..49758ede67 100644
--- a/files/es/learn/html/introduction_to_html/advanced_text_formatting/index.html
+++ b/files/es/learn/html/introduction_to_html/advanced_text_formatting/index.html
@@ -1,6 +1,6 @@
 ---
 title: Formateo de texto avanzado
-slug: Learn/HTML/Introduccion_a_HTML/Advanced_text_formatting
+slug: Learn/HTML/Introduction_to_HTML/Advanced_text_formatting
 tags:
   - CodingScripting
   - Guía
@@ -14,6 +14,7 @@ tags:
   - cita
   - semántica
 translation_of: Learn/HTML/Introduction_to_HTML/Advanced_text_formatting
+original_slug: Learn/HTML/Introduccion_a_HTML/Advanced_text_formatting
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/html/introduction_to_html/creating_hyperlinks/index.html b/files/es/learn/html/introduction_to_html/creating_hyperlinks/index.html
index 330bf0d7db..6a1307c5e5 100644
--- a/files/es/learn/html/introduction_to_html/creating_hyperlinks/index.html
+++ b/files/es/learn/html/introduction_to_html/creating_hyperlinks/index.html
@@ -1,6 +1,6 @@
 ---
 title: Crear hipervínculos
-slug: Learn/HTML/Introduccion_a_HTML/Creating_hyperlinks
+slug: Learn/HTML/Introduction_to_HTML/Creating_hyperlinks
 tags:
   - Aprender
   - CodingScripting
@@ -20,6 +20,7 @@ tags:
   - título
   - urls
 translation_of: Learn/HTML/Introduction_to_HTML/Creating_hyperlinks
+original_slug: Learn/HTML/Introduccion_a_HTML/Creating_hyperlinks
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/html/introduction_to_html/debugging_html/index.html b/files/es/learn/html/introduction_to_html/debugging_html/index.html
index 114b93ff0f..d647a6db17 100644
--- a/files/es/learn/html/introduction_to_html/debugging_html/index.html
+++ b/files/es/learn/html/introduction_to_html/debugging_html/index.html
@@ -1,6 +1,6 @@
 ---
 title: Depurar el HTML
-slug: Learn/HTML/Introduccion_a_HTML/Debugging_HTML
+slug: Learn/HTML/Introduction_to_HTML/Debugging_HTML
 tags:
   - Error
   - Guía
@@ -11,6 +11,7 @@ tags:
   - depurar
   - programar
 translation_of: Learn/HTML/Introduction_to_HTML/Debugging_HTML
+original_slug: Learn/HTML/Introduccion_a_HTML/Debugging_HTML
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/html/introduction_to_html/document_and_website_structure/index.html b/files/es/learn/html/introduction_to_html/document_and_website_structure/index.html
index 1f5f1e315c..14d5394700 100644
--- a/files/es/learn/html/introduction_to_html/document_and_website_structure/index.html
+++ b/files/es/learn/html/introduction_to_html/document_and_website_structure/index.html
@@ -1,6 +1,6 @@
 ---
 title: Estructura web y documentación
-slug: Learn/HTML/Introduccion_a_HTML/estructura
+slug: Learn/HTML/Introduction_to_HTML/Document_and_website_structure
 tags:
   - CodingScripting
   - Composición
@@ -17,6 +17,7 @@ tags:
   - programar
   - semántica
 translation_of: Learn/HTML/Introduction_to_HTML/Document_and_website_structure
+original_slug: Learn/HTML/Introduccion_a_HTML/estructura
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/html/introduction_to_html/getting_started/index.html b/files/es/learn/html/introduction_to_html/getting_started/index.html
index c05aa6a9f0..331be30043 100644
--- a/files/es/learn/html/introduction_to_html/getting_started/index.html
+++ b/files/es/learn/html/introduction_to_html/getting_started/index.html
@@ -1,6 +1,6 @@
 ---
 title: Empezar con HTML
-slug: Learn/HTML/Introduccion_a_HTML/iniciar
+slug: Learn/HTML/Introduction_to_HTML/Getting_started
 tags:
   - Atributos
   - Elemento
@@ -9,6 +9,7 @@ tags:
   - Principiante
   - comentários
 translation_of: Learn/HTML/Introduction_to_HTML/Getting_started
+original_slug: Learn/HTML/Introduccion_a_HTML/iniciar
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/html/introduction_to_html/html_text_fundamentals/index.html b/files/es/learn/html/introduction_to_html/html_text_fundamentals/index.html
index 912acb7dfe..26c7cf3963 100644
--- a/files/es/learn/html/introduction_to_html/html_text_fundamentals/index.html
+++ b/files/es/learn/html/introduction_to_html/html_text_fundamentals/index.html
@@ -1,6 +1,6 @@
 ---
 title: Fundamentos de texto en HTML
-slug: Learn/HTML/Introduccion_a_HTML/texto
+slug: Learn/HTML/Introduction_to_HTML/HTML_text_fundamentals
 tags:
   - CodingScripting
   - Encabezados
@@ -15,6 +15,7 @@ tags:
   - aprende
   - semántica
 translation_of: Learn/HTML/Introduction_to_HTML/HTML_text_fundamentals
+original_slug: Learn/HTML/Introduccion_a_HTML/texto
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/html/introduction_to_html/index.html b/files/es/learn/html/introduction_to_html/index.html
index 64c70649cb..cbbb3806eb 100644
--- a/files/es/learn/html/introduction_to_html/index.html
+++ b/files/es/learn/html/introduction_to_html/index.html
@@ -1,6 +1,6 @@
 ---
 title: Introducción a HTML
-slug: Learn/HTML/Introduccion_a_HTML
+slug: Learn/HTML/Introduction_to_HTML
 tags:
   - CodingScripting
   - Enlaces
@@ -10,6 +10,7 @@ tags:
   - Texto
   - semántica
 translation_of: Learn/HTML/Introduction_to_HTML
+original_slug: Learn/HTML/Introduccion_a_HTML
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/html/introduction_to_html/marking_up_a_letter/index.html b/files/es/learn/html/introduction_to_html/marking_up_a_letter/index.html
index e53bb01826..5e1f868f5a 100644
--- a/files/es/learn/html/introduction_to_html/marking_up_a_letter/index.html
+++ b/files/es/learn/html/introduction_to_html/marking_up_a_letter/index.html
@@ -1,6 +1,6 @@
 ---
 title: Marcando una Carta
-slug: Learn/HTML/Introduccion_a_HTML/Marking_up_a_letter
+slug: Learn/HTML/Introduction_to_HTML/Marking_up_a_letter
 tags:
   - Cabecera
   - Codificación
@@ -9,6 +9,7 @@ tags:
   - Principiante
   - Texto
 translation_of: Learn/HTML/Introduction_to_HTML/Marking_up_a_letter
+original_slug: Learn/HTML/Introduccion_a_HTML/Marking_up_a_letter
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/html/introduction_to_html/structuring_a_page_of_content/index.html b/files/es/learn/html/introduction_to_html/structuring_a_page_of_content/index.html
index 686940212e..3e86e166dd 100644
--- a/files/es/learn/html/introduction_to_html/structuring_a_page_of_content/index.html
+++ b/files/es/learn/html/introduction_to_html/structuring_a_page_of_content/index.html
@@ -1,6 +1,6 @@
 ---
 title: Estructuración de una Página de contenido
-slug: Learn/HTML/Introduccion_a_HTML/Estructuración_de_una_página_de_contenido
+slug: Learn/HTML/Introduction_to_HTML/Structuring_a_page_of_content
 tags:
   - Aprendizaje
   - Diseño
@@ -12,6 +12,7 @@ tags:
   - Prototipado
   - semántica
 translation_of: Learn/HTML/Introduction_to_HTML/Structuring_a_page_of_content
+original_slug: Learn/HTML/Introduccion_a_HTML/Estructuración_de_una_página_de_contenido
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/html/introduction_to_html/test_your_skills_colon__advanced_html_text/index.html b/files/es/learn/html/introduction_to_html/test_your_skills_colon__advanced_html_text/index.html
index f29638eb81..908d34bcc6 100644
--- a/files/es/learn/html/introduction_to_html/test_your_skills_colon__advanced_html_text/index.html
+++ b/files/es/learn/html/introduction_to_html/test_your_skills_colon__advanced_html_text/index.html
@@ -1,7 +1,8 @@
 ---
 title: 'Pon a prueba tus habilidades: texto HTML avanzado'
-slug: 'Learn/HTML/Introduccion_a_HTML/Test_your_skills:_Advanced_HTML_text'
-translation_of: 'Learn/HTML/Introduction_to_HTML/Test_your_skills:_Advanced_HTML_text'
+slug: Learn/HTML/Introduction_to_HTML/Test_your_skills:_Advanced_HTML_text
+translation_of: Learn/HTML/Introduction_to_HTML/Test_your_skills:_Advanced_HTML_text
+original_slug: Learn/HTML/Introduccion_a_HTML/Test_your_skills:_Advanced_HTML_text
 ---
 <div>{{learnsidebar}}</div>
 
diff --git a/files/es/learn/html/introduction_to_html/test_your_skills_colon__html_text_basics/index.html b/files/es/learn/html/introduction_to_html/test_your_skills_colon__html_text_basics/index.html
index f35a083987..c84019c672 100644
--- a/files/es/learn/html/introduction_to_html/test_your_skills_colon__html_text_basics/index.html
+++ b/files/es/learn/html/introduction_to_html/test_your_skills_colon__html_text_basics/index.html
@@ -1,13 +1,14 @@
 ---
 title: 'Prueba tus habilidades: Texto básico HTML'
-slug: 'Learn/HTML/Introduccion_a_HTML/Prueba_tus_habilidades:_Texto_básico_HTML'
+slug: Learn/HTML/Introduction_to_HTML/Test_your_skills:_HTML_text_basics
 tags:
   - Aprendizaje
   - HTML
   - Principiante
   - Prueba tus habilidades
   - Texto
-translation_of: 'Learn/HTML/Introduction_to_HTML/Test_your_skills:_HTML_text_basics'
+translation_of: Learn/HTML/Introduction_to_HTML/Test_your_skills:_HTML_text_basics
+original_slug: Learn/HTML/Introduccion_a_HTML/Prueba_tus_habilidades:_Texto_básico_HTML
 ---
 <div>{{learnsidebar}}</div>
 
diff --git a/files/es/learn/html/introduction_to_html/test_your_skills_colon__links/index.html b/files/es/learn/html/introduction_to_html/test_your_skills_colon__links/index.html
index 0e8dc1bfaf..20e3e0f363 100644
--- a/files/es/learn/html/introduction_to_html/test_your_skills_colon__links/index.html
+++ b/files/es/learn/html/introduction_to_html/test_your_skills_colon__links/index.html
@@ -1,7 +1,8 @@
 ---
 title: 'Prueba tus habilidades: Enlaces'
-slug: 'Learn/HTML/Introduccion_a_HTML/Prueba_tus_habilidades:_Enlaces'
-translation_of: 'Learn/HTML/Introduction_to_HTML/Test_your_skills:_Links'
+slug: Learn/HTML/Introduction_to_HTML/Test_your_skills:_Links
+translation_of: Learn/HTML/Introduction_to_HTML/Test_your_skills:_Links
+original_slug: Learn/HTML/Introduccion_a_HTML/Prueba_tus_habilidades:_Enlaces
 ---
 <div>{{learnsidebar}}</div>
 
diff --git a/files/es/learn/html/introduction_to_html/the_head_metadata_in_html/index.html b/files/es/learn/html/introduction_to_html/the_head_metadata_in_html/index.html
index 6fc5f94ab0..6dd14ce1e1 100644
--- a/files/es/learn/html/introduction_to_html/the_head_metadata_in_html/index.html
+++ b/files/es/learn/html/introduction_to_html/the_head_metadata_in_html/index.html
@@ -1,6 +1,6 @@
 ---
 title: ¿Qué hay en la cabecera? Metadatos en HTML
-slug: Learn/HTML/Introduccion_a_HTML/Metados_en
+slug: Learn/HTML/Introduction_to_HTML/The_head_metadata_in_HTML
 tags:
   - Cabecera
   - CodingScripting
@@ -15,6 +15,7 @@ tags:
   - lang
   - metadata
 translation_of: Learn/HTML/Introduction_to_HTML/The_head_metadata_in_HTML
+original_slug: Learn/HTML/Introduccion_a_HTML/Metados_en
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/html/tables/advanced/index.html b/files/es/learn/html/tables/advanced/index.html
index a74817c5d4..6c008ab50b 100644
--- a/files/es/learn/html/tables/advanced/index.html
+++ b/files/es/learn/html/tables/advanced/index.html
@@ -1,7 +1,8 @@
 ---
 title: Funciones avanzadas de las tablas HTML y accesibilidad
-slug: Learn/HTML/Tablas/Funciones_avanzadas_de_las_tablas_HTML_y_accesibilidad
+slug: Learn/HTML/Tables/Advanced
 translation_of: Learn/HTML/Tables/Advanced
+original_slug: Learn/HTML/Tablas/Funciones_avanzadas_de_las_tablas_HTML_y_accesibilidad
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/html/tables/basics/index.html b/files/es/learn/html/tables/basics/index.html
index 7259adf427..c7af02ac17 100644
--- a/files/es/learn/html/tables/basics/index.html
+++ b/files/es/learn/html/tables/basics/index.html
@@ -1,7 +1,8 @@
 ---
 title: Conceptos básicos de las tablas HTML
-slug: Learn/HTML/Tablas/Conceptos_básicos_de_las_tablas_HTML
+slug: Learn/HTML/Tables/Basics
 translation_of: Learn/HTML/Tables/Basics
+original_slug: Learn/HTML/Tablas/Conceptos_básicos_de_las_tablas_HTML
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/html/tables/index.html b/files/es/learn/html/tables/index.html
index 7d04eb0cbf..39ef075b20 100644
--- a/files/es/learn/html/tables/index.html
+++ b/files/es/learn/html/tables/index.html
@@ -1,7 +1,8 @@
 ---
 title: Tablas HTML
-slug: Learn/HTML/Tablas
+slug: Learn/HTML/Tables
 translation_of: Learn/HTML/Tables
+original_slug: Learn/HTML/Tablas
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/html/tables/structuring_planet_data/index.html b/files/es/learn/html/tables/structuring_planet_data/index.html
index e9868bb95a..8d8e219fa9 100644
--- a/files/es/learn/html/tables/structuring_planet_data/index.html
+++ b/files/es/learn/html/tables/structuring_planet_data/index.html
@@ -1,7 +1,8 @@
 ---
 title: 'Evaluación: Estructurando datos planetarios'
-slug: Learn/HTML/Tablas/Structuring_planet_data
+slug: Learn/HTML/Tables/Structuring_planet_data
 translation_of: Learn/HTML/Tables/Structuring_planet_data
+original_slug: Learn/HTML/Tablas/Structuring_planet_data
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/javascript/building_blocks/build_your_own_function/index.html b/files/es/learn/javascript/building_blocks/build_your_own_function/index.html
index 5f9bcc7c8b..052ddb8b78 100644
--- a/files/es/learn/javascript/building_blocks/build_your_own_function/index.html
+++ b/files/es/learn/javascript/building_blocks/build_your_own_function/index.html
@@ -1,6 +1,6 @@
 ---
 title: Construye tu propia función
-slug: Learn/JavaScript/Building_blocks/Construyendo_tu_propia_funcion
+slug: Learn/JavaScript/Building_blocks/Build_your_own_function
 tags:
   - Aprender
   - Artículo
@@ -11,6 +11,7 @@ tags:
   - Principiante
   - Tutorial
 translation_of: Learn/JavaScript/Building_blocks/Build_your_own_function
+original_slug: Learn/JavaScript/Building_blocks/Construyendo_tu_propia_funcion
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/javascript/building_blocks/events/index.html b/files/es/learn/javascript/building_blocks/events/index.html
index 7bdb81768a..5fc7ee8df5 100644
--- a/files/es/learn/javascript/building_blocks/events/index.html
+++ b/files/es/learn/javascript/building_blocks/events/index.html
@@ -1,7 +1,8 @@
 ---
 title: Introducción a eventos
-slug: Learn/JavaScript/Building_blocks/Eventos
+slug: Learn/JavaScript/Building_blocks/Events
 translation_of: Learn/JavaScript/Building_blocks/Events
+original_slug: Learn/JavaScript/Building_blocks/Eventos
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/javascript/building_blocks/image_gallery/index.html b/files/es/learn/javascript/building_blocks/image_gallery/index.html
index 205f1a11aa..a4bad1842e 100644
--- a/files/es/learn/javascript/building_blocks/image_gallery/index.html
+++ b/files/es/learn/javascript/building_blocks/image_gallery/index.html
@@ -1,7 +1,8 @@
 ---
 title: Galería de imágenes
-slug: Learn/JavaScript/Building_blocks/Galeria_de_imagenes
+slug: Learn/JavaScript/Building_blocks/Image_gallery
 translation_of: Learn/JavaScript/Building_blocks/Image_gallery
+original_slug: Learn/JavaScript/Building_blocks/Galeria_de_imagenes
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/javascript/building_blocks/looping_code/index.html b/files/es/learn/javascript/building_blocks/looping_code/index.html
index e26509afc5..c1386a16ed 100644
--- a/files/es/learn/javascript/building_blocks/looping_code/index.html
+++ b/files/es/learn/javascript/building_blocks/looping_code/index.html
@@ -1,7 +1,8 @@
 ---
 title: Bucles
-slug: Learn/JavaScript/Building_blocks/Bucle_codigo
+slug: Learn/JavaScript/Building_blocks/Looping_code
 translation_of: Learn/JavaScript/Building_blocks/Looping_code
+original_slug: Learn/JavaScript/Building_blocks/Bucle_codigo
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/javascript/client-side_web_apis/introduction/index.html b/files/es/learn/javascript/client-side_web_apis/introduction/index.html
index fc73d4ebc9..931a5d1328 100644
--- a/files/es/learn/javascript/client-side_web_apis/introduction/index.html
+++ b/files/es/learn/javascript/client-side_web_apis/introduction/index.html
@@ -1,7 +1,8 @@
 ---
 title: Introducción a las APIs web
-slug: Learn/JavaScript/Client-side_web_APIs/Introducción
+slug: Learn/JavaScript/Client-side_web_APIs/Introduction
 translation_of: Learn/JavaScript/Client-side_web_APIs/Introduction
+original_slug: Learn/JavaScript/Client-side_web_APIs/Introducción
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/javascript/first_steps/math/index.html b/files/es/learn/javascript/first_steps/math/index.html
index d9117ed211..9533ac05d8 100644
--- a/files/es/learn/javascript/first_steps/math/index.html
+++ b/files/es/learn/javascript/first_steps/math/index.html
@@ -1,6 +1,6 @@
 ---
 title: Matemáticas básicas en JavaScript — números y operadores
-slug: Learn/JavaScript/First_steps/Matemáticas
+slug: Learn/JavaScript/First_steps/Math
 tags:
   - Aprender
   - Artículo
@@ -12,9 +12,10 @@ tags:
   - Operadores
   - Principiante
   - incremento
-  - 'l10n:priority'
+  - l10n:priority
   - modulo
 translation_of: Learn/JavaScript/First_steps/Math
+original_slug: Learn/JavaScript/First_steps/Matemáticas
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/javascript/first_steps/silly_story_generator/index.html b/files/es/learn/javascript/first_steps/silly_story_generator/index.html
index 58bb8e688a..c3b7d16dfe 100644
--- a/files/es/learn/javascript/first_steps/silly_story_generator/index.html
+++ b/files/es/learn/javascript/first_steps/silly_story_generator/index.html
@@ -1,6 +1,6 @@
 ---
 title: Generador de historias absurdas
-slug: Learn/JavaScript/First_steps/Generador_de_historias_absurdas
+slug: Learn/JavaScript/First_steps/Silly_story_generator
 tags:
   - Arreglos
   - Cadenas
@@ -8,6 +8,7 @@ tags:
   - Numeros
   - Principiante
 translation_of: Learn/JavaScript/First_steps/Silly_story_generator
+original_slug: Learn/JavaScript/First_steps/Generador_de_historias_absurdas
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/javascript/first_steps/test_your_skills_colon__strings/index.html b/files/es/learn/javascript/first_steps/test_your_skills_colon__strings/index.html
index f919ac1ee3..05bd91d296 100644
--- a/files/es/learn/javascript/first_steps/test_your_skills_colon__strings/index.html
+++ b/files/es/learn/javascript/first_steps/test_your_skills_colon__strings/index.html
@@ -1,6 +1,6 @@
 ---
 title: 'Prueba tus habilidades: Strings'
-slug: 'Learn/JavaScript/First_steps/Prueba_tus_habilidades:_Strings'
+slug: Learn/JavaScript/First_steps/Test_your_skills:_Strings
 tags:
   - Cadenas
   - JavaScript
@@ -9,7 +9,8 @@ tags:
   - Prueba tus habilidades
   - aprende
   - strings
-translation_of: 'Learn/JavaScript/First_steps/Test_your_skills:_Strings'
+translation_of: Learn/JavaScript/First_steps/Test_your_skills:_Strings
+original_slug: Learn/JavaScript/First_steps/Prueba_tus_habilidades:_Strings
 ---
 <div>{{learnsidebar}}</div>
 
diff --git a/files/es/learn/javascript/first_steps/what_is_javascript/index.html b/files/es/learn/javascript/first_steps/what_is_javascript/index.html
index bd845c8681..f26d6116ea 100644
--- a/files/es/learn/javascript/first_steps/what_is_javascript/index.html
+++ b/files/es/learn/javascript/first_steps/what_is_javascript/index.html
@@ -1,6 +1,6 @@
 ---
 title: ¿Qué es JavaScript?
-slug: Learn/JavaScript/First_steps/Qué_es_JavaScript
+slug: Learn/JavaScript/First_steps/What_is_JavaScript
 tags:
   - APIs
   - Aprender
@@ -17,6 +17,7 @@ tags:
   - comentários
   - externo
 translation_of: Learn/JavaScript/First_steps/What_is_JavaScript
+original_slug: Learn/JavaScript/First_steps/Qué_es_JavaScript
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/javascript/objects/object_building_practice/index.html b/files/es/learn/javascript/objects/object_building_practice/index.html
index 6dfaaf0d08..6814a34289 100644
--- a/files/es/learn/javascript/objects/object_building_practice/index.html
+++ b/files/es/learn/javascript/objects/object_building_practice/index.html
@@ -1,7 +1,8 @@
 ---
 title: Ejercicio práctico de construcción de objetos
-slug: Learn/JavaScript/Objects/Ejercicio_práctico_de_construcción_de_objetos
+slug: Learn/JavaScript/Objects/Object_building_practice
 translation_of: Learn/JavaScript/Objects/Object_building_practice
+original_slug: Learn/JavaScript/Objects/Ejercicio_práctico_de_construcción_de_objetos
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/learning_and_getting_help/index.html b/files/es/learn/learning_and_getting_help/index.html
index a7f06d90d8..e78bcbff0c 100644
--- a/files/es/learn/learning_and_getting_help/index.html
+++ b/files/es/learn/learning_and_getting_help/index.html
@@ -1,6 +1,6 @@
 ---
 title: Aprender y obtener ayuda
-slug: Learn/Aprender_y_obtener_ayuda
+slug: Learn/Learning_and_getting_help
 tags:
   - Aprender
   - Desarrollo web
@@ -8,6 +8,7 @@ tags:
   - conseguir ayuda
   - obtener ayuda
 translation_of: Learn/Learning_and_getting_help
+original_slug: Learn/Aprender_y_obtener_ayuda
 ---
 <p>{{learnsidebar}}</p>
 
diff --git a/files/es/learn/server-side/configuring_server_mime_types/index.html b/files/es/learn/server-side/configuring_server_mime_types/index.html
index 782c328151..f8144877ba 100644
--- a/files/es/learn/server-side/configuring_server_mime_types/index.html
+++ b/files/es/learn/server-side/configuring_server_mime_types/index.html
@@ -1,12 +1,13 @@
 ---
 title: Configurar correctamente los tipos MIME del servidor
-slug: Configurar_correctamente_los_tipos_MIME_del_servidor
+slug: Learn/Server-side/Configuring_server_MIME_types
 tags:
   - Desarrollo_Web
   - Estándares_Web
   - Seguridad
   - Todas_las_Categorías
 translation_of: Learn/Server-side/Configuring_server_MIME_types
+original_slug: Configurar_correctamente_los_tipos_MIME_del_servidor
 ---
 <p>
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diff --git a/files/es/learn/server-side/django/introduction/index.html b/files/es/learn/server-side/django/introduction/index.html
index 484b311a2c..a1571a1d00 100644
--- a/files/es/learn/server-side/django/introduction/index.html
+++ b/files/es/learn/server-side/django/introduction/index.html
@@ -1,6 +1,6 @@
 ---
 title: Introducción a Django
-slug: Learn/Server-side/Django/Introducción
+slug: Learn/Server-side/Django/Introduction
 tags:
   - Aprendizaje
   - CodigoScript
@@ -10,6 +10,7 @@ tags:
   - django
   - introducción
 translation_of: Learn/Server-side/Django/Introduction
+original_slug: Learn/Server-side/Django/Introducción
 ---
 <div>{{LearnSidebar}}</div>
 
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index 05ce1f9451..db0a949c2d 100644
--- a/files/es/learn/server-side/first_steps/client-server_overview/index.html
+++ b/files/es/learn/server-side/first_steps/client-server_overview/index.html
@@ -1,6 +1,6 @@
 ---
 title: Visión General Cliente-Servidor
-slug: Learn/Server-side/Primeros_pasos/Vision_General_Cliente_Servidor
+slug: Learn/Server-side/First_steps/Client-Server_overview
 tags:
   - Aprendizaje
   - Codificación de scripts
@@ -10,6 +10,7 @@ tags:
   - Servidor
   - introducción
 translation_of: Learn/Server-side/First_steps/Client-Server_overview
+original_slug: Learn/Server-side/Primeros_pasos/Vision_General_Cliente_Servidor
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/server-side/first_steps/index.html b/files/es/learn/server-side/first_steps/index.html
index 19a5454b4b..d7893b51d3 100644
--- a/files/es/learn/server-side/first_steps/index.html
+++ b/files/es/learn/server-side/first_steps/index.html
@@ -1,6 +1,6 @@
 ---
 title: Primeros Pasos en la Programación de Lado-Servidor
-slug: Learn/Server-side/Primeros_pasos
+slug: Learn/Server-side/First_steps
 tags:
   - Aprendizaje
   - Aterrizaje
@@ -10,6 +10,7 @@ tags:
   - Programación lado servidor
   - introducción
 translation_of: Learn/Server-side/First_steps
+original_slug: Learn/Server-side/Primeros_pasos
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/server-side/first_steps/introduction/index.html b/files/es/learn/server-side/first_steps/introduction/index.html
index 0b0d2da59e..32d5f3363b 100644
--- a/files/es/learn/server-side/first_steps/introduction/index.html
+++ b/files/es/learn/server-side/first_steps/introduction/index.html
@@ -1,6 +1,6 @@
 ---
 title: Introducción al lado servidor
-slug: Learn/Server-side/Primeros_pasos/Introducción
+slug: Learn/Server-side/First_steps/Introduction
 tags:
   - Aprendizaje
   - Codificación de scripts
@@ -10,6 +10,7 @@ tags:
   - Servidor
   - introducción
 translation_of: Learn/Server-side/First_steps/Introduction
+original_slug: Learn/Server-side/Primeros_pasos/Introducción
 ---
 <div>{{LearnSidebar}}</div>
 
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index 8c381a772e..6e23f8586d 100644
--- a/files/es/learn/server-side/first_steps/web_frameworks/index.html
+++ b/files/es/learn/server-side/first_steps/web_frameworks/index.html
@@ -1,6 +1,6 @@
 ---
 title: Frameworks Web de lado servidor
-slug: Learn/Server-side/Primeros_pasos/Web_frameworks
+slug: Learn/Server-side/First_steps/Web_frameworks
 tags:
   - Aprendizaje
   - Codificación de scripts
@@ -11,6 +11,7 @@ tags:
   - Servidor
   - introducción
 translation_of: Learn/Server-side/First_steps/Web_frameworks
+original_slug: Learn/Server-side/Primeros_pasos/Web_frameworks
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/server-side/first_steps/website_security/index.html b/files/es/learn/server-side/first_steps/website_security/index.html
index c2630fc050..92ed22736a 100644
--- a/files/es/learn/server-side/first_steps/website_security/index.html
+++ b/files/es/learn/server-side/first_steps/website_security/index.html
@@ -1,6 +1,6 @@
 ---
 title: Seguridad de Sitios Web
-slug: Learn/Server-side/Primeros_pasos/seguridad_sitios_web
+slug: Learn/Server-side/First_steps/Website_security
 tags:
   - Aprendizaje
   - Codificación de scripts
@@ -12,6 +12,7 @@ tags:
   - Seguridad de sitios Web
   - introducción
 translation_of: Learn/Server-side/First_steps/Website_security
+original_slug: Learn/Server-side/Primeros_pasos/seguridad_sitios_web
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/tools_and_testing/client-side_javascript_frameworks/index.html b/files/es/learn/tools_and_testing/client-side_javascript_frameworks/index.html
index e9bdd36eca..81a3a24914 100644
--- a/files/es/learn/tools_and_testing/client-side_javascript_frameworks/index.html
+++ b/files/es/learn/tools_and_testing/client-side_javascript_frameworks/index.html
@@ -1,10 +1,11 @@
 ---
 title: Entendiendo los frameworks de JavaScript del lado del cliente
-slug: Learn/Herramientas_y_pruebas/Lado-del-cliente_JavaScript_frameworks
+slug: Learn/Tools_and_testing/Client-side_JavaScript_frameworks
 tags:
   - Aprender
   - Principiante
 translation_of: Learn/Tools_and_testing/Client-side_JavaScript_frameworks
+original_slug: Learn/Herramientas_y_pruebas/Lado-del-cliente_JavaScript_frameworks
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/tools_and_testing/client-side_javascript_frameworks/react_getting_started/index.html b/files/es/learn/tools_and_testing/client-side_javascript_frameworks/react_getting_started/index.html
index 09c28f11a9..121d2684d1 100644
--- a/files/es/learn/tools_and_testing/client-side_javascript_frameworks/react_getting_started/index.html
+++ b/files/es/learn/tools_and_testing/client-side_javascript_frameworks/react_getting_started/index.html
@@ -1,13 +1,15 @@
 ---
 title: Primeros pasos en React
 slug: >-
-  Learn/Herramientas_y_pruebas/Lado-del-cliente_JavaScript_frameworks/React_getting_started
+  Learn/Tools_and_testing/Client-side_JavaScript_frameworks/React_getting_started
 tags:
   - Aprender
   - Aprendiz
   - Principiante
 translation_of: >-
   Learn/Tools_and_testing/Client-side_JavaScript_frameworks/React_getting_started
+original_slug: >-
+  Learn/Herramientas_y_pruebas/Lado-del-cliente_JavaScript_frameworks/React_getting_started
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/tools_and_testing/client-side_javascript_frameworks/vue_getting_started/index.html b/files/es/learn/tools_and_testing/client-side_javascript_frameworks/vue_getting_started/index.html
index ea24ac2a81..1e5640d9e3 100644
--- a/files/es/learn/tools_and_testing/client-side_javascript_frameworks/vue_getting_started/index.html
+++ b/files/es/learn/tools_and_testing/client-side_javascript_frameworks/vue_getting_started/index.html
@@ -1,8 +1,9 @@
 ---
 title: Primeros pasos con Vue
-slug: >-
-  Learn/Herramientas_y_pruebas/Lado-del-cliente_JavaScript_frameworks/Vue_primeros_pasos
+slug: Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Vue_getting_started
 translation_of: Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Vue_getting_started
+original_slug: >-
+  Learn/Herramientas_y_pruebas/Lado-del-cliente_JavaScript_frameworks/Vue_primeros_pasos
 ---
 <div>{{LearnSidebar}}</div>
 
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index 73bd6299a1..f9f0a26a7c 100644
--- a/files/es/learn/tools_and_testing/cross_browser_testing/index.html
+++ b/files/es/learn/tools_and_testing/cross_browser_testing/index.html
@@ -1,7 +1,8 @@
 ---
 title: Cross browser testing
-slug: Learn/Herramientas_y_pruebas/Cross_browser_testing
+slug: Learn/Tools_and_testing/Cross_browser_testing
 translation_of: Learn/Tools_and_testing/Cross_browser_testing
+original_slug: Learn/Herramientas_y_pruebas/Cross_browser_testing
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/tools_and_testing/github/index.html b/files/es/learn/tools_and_testing/github/index.html
index 62646f1cc4..77d02cf0de 100644
--- a/files/es/learn/tools_and_testing/github/index.html
+++ b/files/es/learn/tools_and_testing/github/index.html
@@ -1,6 +1,6 @@
 ---
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-slug: Learn/Herramientas_y_pruebas/GitHub
+slug: Learn/Tools_and_testing/GitHub
 tags:
   - Aprender
   - GitHub
@@ -8,6 +8,7 @@ tags:
   - Web
   - git
 translation_of: Learn/Tools_and_testing/GitHub
+original_slug: Learn/Herramientas_y_pruebas/GitHub
 ---
 <div>{{LearnSidebar}}</div>
 
diff --git a/files/es/learn/tools_and_testing/index.html b/files/es/learn/tools_and_testing/index.html
index a147c98f65..5c15d17096 100644
--- a/files/es/learn/tools_and_testing/index.html
+++ b/files/es/learn/tools_and_testing/index.html
@@ -1,6 +1,6 @@
 ---
 title: Herramientas y pruebas
-slug: Learn/Herramientas_y_pruebas
+slug: Learn/Tools_and_testing
 tags:
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   - Aprender
@@ -17,6 +17,7 @@ tags:
   - Testing
   - automatización
 translation_of: Learn/Tools_and_testing
+original_slug: Learn/Herramientas_y_pruebas
 ---
 <div>
 <p>{{LearnSidebar}}</p>
diff --git a/files/es/learn/tools_and_testing/understanding_client-side_tools/index.html b/files/es/learn/tools_and_testing/understanding_client-side_tools/index.html
index 6221b0382f..a18738e8a6 100644
--- a/files/es/learn/tools_and_testing/understanding_client-side_tools/index.html
+++ b/files/es/learn/tools_and_testing/understanding_client-side_tools/index.html
@@ -1,6 +1,6 @@
 ---
 title: Understanding client-side web development tools
-slug: Learn/Herramientas_y_pruebas/Understanding_client-side_tools
+slug: Learn/Tools_and_testing/Understanding_client-side_tools
 tags:
   - Aprender
   - CSS
@@ -13,6 +13,7 @@ tags:
   - client-side
   - lado del cliente
 translation_of: Learn/Tools_and_testing/Understanding_client-side_tools
+original_slug: Learn/Herramientas_y_pruebas/Understanding_client-side_tools
 ---
 <div>{{LearnSidebar}}</div>