diff --git a/app/models/metadata_lang.rb b/app/models/metadata_lang.rb
new file mode 100644
index 00000000..1ad381a3
--- /dev/null
+++ b/app/models/metadata_lang.rb
@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+# Un campo de idioma
+class MetadataLang < MetadataTemplate
+  def default_value
+    I18n.locale
+  end
+
+  def value
+    self[:value] || document.collection.label.to_sym
+  end
+
+  def values
+    I18n.available_locales
+  end
+end
diff --git a/app/models/metadata_path.rb b/app/models/metadata_path.rb
index b3f3b1a5..05e3ed41 100644
--- a/app/models/metadata_path.rb
+++ b/app/models/metadata_path.rb
@@ -28,7 +28,7 @@ class MetadataPath < MetadataTemplate
   end
 
   def lang
-    post.lang
+    post.lang.value
   end
 
   def slug
diff --git a/app/models/post.rb b/app/models/post.rb
index ace24875..7aab8124 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -12,8 +12,8 @@ class Post < OpenStruct
   # Atributos por defecto
   DEFAULT_ATTRIBUTES = %i[site document layout].freeze
   # Otros atributos que no vienen en los metadatos
-  PRIVATE_ATTRIBUTES = %i[lang path slug attributes errors].freeze
-  PUBLIC_ATTRIBUTES = %i[date].freeze
+  PRIVATE_ATTRIBUTES = %i[path slug attributes errors].freeze
+  PUBLIC_ATTRIBUTES = %i[lang date].freeze
 
   # Redefinir el inicializador de OpenStruct
   #
@@ -47,6 +47,7 @@ class Post < OpenStruct
                                  required: template['required'])
     end
 
+    load_lang!
     load_slug!
     load_date!
     load_path!
@@ -142,7 +143,7 @@ class Post < OpenStruct
     FileUtils.rm_f path.absolute
 
     # TODO: Devolver self en lugar de todo el array
-    site.posts(lang: lang).reject! do |post|
+    site.posts(lang: lang.value).reject! do |post|
       post.path.absolute == path.absolute
     end
   end
@@ -231,6 +232,7 @@ class Post < OpenStruct
 
     save
   end
+  alias update update_attributes
 
   private
 
@@ -292,6 +294,13 @@ class Post < OpenStruct
                                  required: true)
   end
 
+  def load_lang!
+    self.lang = MetadataLang.new(document: document, site: site,
+                                 layout: layout, name: :lang,
+                                 type: :lang, post: self,
+                                 required: true)
+  end
+
   # Ejecuta la acción de guardado en cada atributo
   def save_attributes!
     attributes.map do |attr|
diff --git a/app/models/post_relation.rb b/app/models/post_relation.rb
index 4fa206f4..9e0df2e5 100644
--- a/app/models/post_relation.rb
+++ b/app/models/post_relation.rb
@@ -15,8 +15,8 @@ class PostRelation < Array
   # Genera un artículo nuevo con los parámetros que le pasemos y lo suma
   # al array
   def build(**args)
-    args[:document] ||= build_document
     args[:lang] ||= I18n.locale
+    args[:document] ||= build_document(collection: args[:lang])
     args[:layout] = build_layout(args[:layout])
 
     post = Post.new(site: site, **args)
@@ -31,12 +31,22 @@ class PostRelation < Array
     post
   end
 
+  alias find_generic find
+
   def find(id)
-    super() do |p|
+    find_generic do |p|
       p.id == id
     end
   end
 
+  # Encuentra el primer post por el valor de un atributo
+  # XXX: Acepta cualquier atributo
+  def find_by(**args)
+    find_generic do |p|
+      p.public_send(args.first.first).try(:value) == args.first.last
+    end
+  end
+
   # Intenta guardar todos y devuelve true si pudo
   def save_all
     map(&:save).all?
@@ -51,14 +61,14 @@ class PostRelation < Array
   end
 
   # Devuelve una colección Jekyll que hace pasar el documento
-  def build_collection
-    Jekyll::Collection.new(site.jekyll, 'posts')
+  def build_collection(label:)
+    Jekyll::Collection.new(site.jekyll, label.to_s)
   end
 
   # Un documento borrador con algunas propiedades por defecto
-  def build_document
-    doc = Jekyll::Document.new('', site: site.jekyll,
-                                   collection: build_collection)
+  def build_document(collection:)
+    col = build_collection(label: collection)
+    doc = Jekyll::Document.new('', site: site.jekyll, collection: col)
     doc.data['date'] = Date.today.to_time
     doc
   end
diff --git a/app/services/post_service.rb b/app/services/post_service.rb
index 9c1566fc..0ef151bd 100644
--- a/app/services/post_service.rb
+++ b/app/services/post_service.rb
@@ -8,11 +8,9 @@ PostService = Struct.new(:site, :usuarie, :post, :params, keyword_init: true) do
   # @return Post
   def create
     # TODO: Implementar layout
-    self.post = site.posts.build
-    # TODO: No podemos pasar los post_params a build aun porque para
-    # saber los parámetros tenemos que haber instanciado el post
-    # primero.
-    post.update_attributes(post_params) && commit(action: :created)
+    self.post = site.posts(lang: params[:post][:lang] || I18n.locale).build
+
+    commit(action: :created) if post.update(post_params)
 
     # Devolver el post aunque no se haya salvado para poder rescatar los
     # errores
@@ -20,10 +18,7 @@ PostService = Struct.new(:site, :usuarie, :post, :params, keyword_init: true) do
   end
 
   def update
-    # TODO: No podemos pasar los post_params a build aun porque para
-    # saber los parámetros tenemos que haber instanciado el post
-    # primero.
-    post.update_attributes(post_params) && commit(action: :updated)
+    commit(action: :updated) if post.update(post_params)
 
     # Devolver el post aunque no se haya salvado para poder rescatar los
     # errores
@@ -31,7 +26,9 @@ PostService = Struct.new(:site, :usuarie, :post, :params, keyword_init: true) do
   end
 
   def destroy
-    post.destroy! && commit(action: :destroyed)
+    post.destroy!
+
+    commit(action: :destroyed) if post.destroyed?
 
     post
   end
diff --git a/app/services/site_service.rb b/app/services/site_service.rb
index 94bedbbd..8d2a090f 100644
--- a/app/services/site_service.rb
+++ b/app/services/site_service.rb
@@ -17,6 +17,8 @@ SiteService = Struct.new(:site, :usuarie, :params, keyword_init: true) do
         commit_config(action: :create)
     end
 
+    add_licencias
+
     site
   end
 
@@ -46,5 +48,27 @@ SiteService = Struct.new(:site, :usuarie, :params, keyword_init: true) do
     site.roles << Rol.new(site: site, usuarie: usuarie,
                           temporal: temporal, rol: rol)
   end
+
+  # Crea la licencia del sitio para cada locale disponible
+  # rubocop:disable Metrics/MethodLength
+  def add_licencias
+    I18n.available_locales.each do |locale|
+      Mobility.with_locale(locale) do
+        params = ActionController::Parameters.new(
+          post: {
+            lang: locale,
+            title: site.licencia.name,
+            author: %w[Sutty],
+            permalink: "#{I18n.t('activerecord.models.licencia').downcase}/",
+            content: site.licencia.deed
+          }
+        )
+
+        PostService.new(site: site, usuarie: usuarie, params: params)
+                   .create
+      end
+    end
+  end
+  # rubocop:enable Metrics/MethodLength
 end
 # rubocop:enable Metrics/BlockLength
diff --git a/app/views/posts/attribute_ro/_lang.haml b/app/views/posts/attribute_ro/_lang.haml
new file mode 100644
index 00000000..cb88aa14
--- /dev/null
+++ b/app/views/posts/attribute_ro/_lang.haml
@@ -0,0 +1,3 @@
+%tr{ id: attribute }
+  %th= post_label_t(attribute, post: post)
+  %td= t(".#{metadata.value}")
diff --git a/app/views/posts/attributes/_lang.haml b/app/views/posts/attributes/_lang.haml
new file mode 100644
index 00000000..d0290ede
--- /dev/null
+++ b/app/views/posts/attributes/_lang.haml
@@ -0,0 +1,2 @@
+-# TODO: Implementar i18n
+= hidden_field 'post[lang]', I18n.locale
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 24a3c5de..47a0d7db 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -59,6 +59,7 @@ en:
   activerecord:
     models:
       usuarie: User
+      licencia: License
     attributes:
       usuarie:
         email: 'E-mail address'
diff --git a/config/locales/es.yml b/config/locales/es.yml
index 72030ba4..03d8cfcf 100644
--- a/config/locales/es.yml
+++ b/config/locales/es.yml
@@ -61,6 +61,7 @@ es:
   activerecord:
     models:
       usuarie: Usuarie
+      licencia: Licencia
     attributes:
       usuarie:
         email: 'Correo electrónico'
diff --git a/db/seeds.rb b/db/seeds.rb
index c36c43bb..fd303779 100644
--- a/db/seeds.rb
+++ b/db/seeds.rb
@@ -5,7 +5,7 @@ designs = YAML.safe_load(File.read('db/seeds/designs.yml'))
 designs.each do |d|
   design = Design.find_or_create_by(gem: d['gem'])
 
-  design.update_attributes d
+  design.update d
 end
 
 licencias = YAML.safe_load(File.read('db/seeds/licencias.yml'))
@@ -13,7 +13,7 @@ licencias = YAML.safe_load(File.read('db/seeds/licencias.yml'))
 licencias.each do |l|
   licencia = Licencia.find_or_create_by(icons: l['icons'])
 
-  licencia.update_attributes l
+  licencia.update l
 end
 
 YAML.safe_load(File.read('db/seeds/sites.yml')).each do |site|
diff --git a/db/seeds/licencias.yml b/db/seeds/licencias.yml
index 27c2931f..73bf5abf 100644
--- a/db/seeds/licencias.yml
+++ b/db/seeds/licencias.yml
@@ -7,14 +7,6 @@
   description_en: 'The Peer Production License is a license that allows use for any purpose under the same terms, except for commercial purposes, which are only allowed for collectives, cooperatives and other worker-owned "enterprises".  We recommend this license if you are inclined towards non-profit terms, since it allows the development of more ethical economies while fending off capitalistic for-profit uses.  If you want to know more about it, we invite you to read [The Telekommunist Manifesto](http://networkcultures.org/blog/publication/no-03-the-telekommunist-manifesto-dmytri-kleiner/)'
   description_es: 'La licencia de Producción de Pares permite el uso con cualquier propósito bajo la misma licencia, a excepción de los usos comerciales que solo están permitidos a colectivos, cooperativas y otras "empresas" en manos de sus trabajadorxs.  Recomendamos esta licencia si te estabas inclinando hacia términos sin fines de lucro, ya que permite el desarrollo de economías más éticas al mismo tiempo que impide la explotación capitalista.  Si te interesa saber más, te invitamos a leer [El manifiesto telecomunista](https://endefensadelsl.org/manifiesto_telecomunista.html).'
   deed_en: |
-    ---
-    title: License
-    permalink: license/
-    layout: post
-    ---
-
-    # Peer Production License (human-readable version)
-
     This is a human-readable summary of the [full
     license](https://wiki.p2pfoundation.net/Peer_Production_License).
 
@@ -54,14 +46,6 @@
       such as publicity, privacy, or moral rights may limit how you use the
       material.
   deed_es: |
-    ---
-    title: Licencia
-    permalink: licencia/
-    layout: post
-    ---
-
-    # Licencia de producción de pares (versión legible por humanas)
-
     Esto es un resumen legible por humanas del [texto legal (la licencia
     completa)](http://endefensadelsl.org/ppl_es.html)
 
@@ -113,7 +97,7 @@
       hacerlo es enlazar a esta página.
 
 - icons: "/images/by.png"
-  name_en: 'Attribution 4.0 International (CC BY 4.0)'
+  name_en: 'Creative Commons Attribution 4.0 International (CC BY 4.0)'
   description_en: "This license gives everyone the freedom to use,
   adapt, and redistribute the contents of your site by requiring
   attribution only.  We recommend this license if you're publishing
@@ -121,7 +105,7 @@
   you want to be attributed.  Users of the site will have to mention the
   source and indicate if they made changes to it."
   url_en: 'https://creativecommons.org/licenses/by/4.0/'
-  name_es: 'Atribución 4.0 Internacional (CC BY 4.0)'
+  name_es: 'Creative Commons Atribución 4.0 Internacional (CC BY 4.0)'
   description_es: "Esta licencia permite a todes la libertad de usar,
   adaptar/modificar y redistribuir los contenidos de tu sitio con la
   única condición de atribuirte la autoría original.  Recomendamos esta
@@ -131,12 +115,6 @@
   indicar si hicieron cambios."
   url_es: 'https://creativecommons.org/licenses/by/4.0/deed.es'
   deed_en: |
-    ---
-    title: License
-    permalink: license/
-    layout: post
-    ---
-
     This is a human-readable summary of (and not a substitute for) the
     [license](https://creativecommons.org/licenses/by/4.0/legalcode).
 
@@ -173,12 +151,6 @@
     such as publicity, privacy, or moral rights may limit how you use the
     material.
   deed_es: |
-    ---
-    title: Licencia
-    permalink: licencia/
-    layout: post
-    ---
-
     Este es un resumen legible por humanes (y no un sustituto) de la
     [licencia](https://creativecommons.org/licenses/by/4.0/legalcode).
 
@@ -215,8 +187,8 @@
     publicidad, privacidad, o derechos morales pueden limitar la forma en que
     utilice el material.
 - icons: "/images/sa.png"
-  name_en: "Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)"
-  name_es: "Atribución-CompartirIgual 4.0 Internacional (CC BY-SA 4.0)"
+  name_en: "Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)"
+  name_es: "Creative Commons Atribución-CompartirIgual 4.0 Internacional (CC BY-SA 4.0)"
   url_en: 'https://creativecommons.org/licenses/by-sa/4.0/'
   url_es: 'https://creativecommons.org/licenses/by-sa/4.0/deed.es'
   description_en: "This license is the same as the CC-BY 4.0 but it adds
@@ -232,12 +204,6 @@
   están permitidos, las mejoras hechas con fines de lucro deben ser
   compartidas bajo la misma licencia."
   deed_en: |
-    ---
-    title: License
-    permalink: license/
-    layout: post
-    ---
-
     This is a human-readable summary of (and not a substitute for) the
     [license](https://creativecommons.org/licenses/by-sa/4.0/legalcode).
 
@@ -279,12 +245,6 @@
     such as publicity, privacy, or moral rights may limit how you use the
     material.
   deed_es: |
-    ---
-    title: Licencia
-    permalink: licencia/
-    layout: post
-    ---
-
     Este es un resumen legible por humanes (y no un sustituto) de la
     [licencia](https://creativecommons.org/licenses/by/4.0/legalcode).
 
diff --git a/test/controllers/api/v1/sites_controller_test.rb b/test/controllers/api/v1/sites_controller_test.rb
index 044ab451..520c0b92 100644
--- a/test/controllers/api/v1/sites_controller_test.rb
+++ b/test/controllers/api/v1/sites_controller_test.rb
@@ -33,7 +33,7 @@ module Api
 
       test 'se puede obtener un listado de todos' do
         get v1_sites_url, headers: @authorization, as: :json
-        assert_equal [@site.name], JSON.parse(response.body)
+        assert_equal Site.all.pluck(:name), JSON.parse(response.body)
       end
     end
   end
diff --git a/test/controllers/posts_controller_test.rb b/test/controllers/posts_controller_test.rb
index 06fb85e9..10a2db19 100644
--- a/test/controllers/posts_controller_test.rb
+++ b/test/controllers/posts_controller_test.rb
@@ -39,7 +39,7 @@ class PostsControllerTest < ActionDispatch::IntegrationTest
 
     # TODO: implementar reload?
     site = Site.find(@site.id)
-    new_post = site.posts.first
+    new_post = site.posts.find_by(title: title)
 
     assert_equal 302, response.status
 
diff --git a/test/controllers/sites_controller_test.rb b/test/controllers/sites_controller_test.rb
index 19b98854..a8bb31db 100644
--- a/test/controllers/sites_controller_test.rb
+++ b/test/controllers/sites_controller_test.rb
@@ -32,7 +32,7 @@ class SitesControllerTest < ActionDispatch::IntegrationTest
 
   test 'se pueden crear' do
     name = SecureRandom.hex
-    design = create :design
+    design = Design.all.sample
 
     post sites_url, headers: @authorization, params: {
       site: {
@@ -40,7 +40,7 @@ class SitesControllerTest < ActionDispatch::IntegrationTest
         title: name,
         description: name * 2,
         design_id: design.id,
-        licencia_id: create(:licencia).id,
+        licencia_id: Licencia.first.id,
         deploys_attributes: {
           '0' => {
             type: 'DeployLocal'
@@ -62,8 +62,15 @@ class SitesControllerTest < ActionDispatch::IntegrationTest
     assert_equal design.gem, site.config.theme
     assert_equal name, site.config.title
     assert_equal name * 2, site.config.description
-    assert_equal I18n.t('site_service.create', name: name),
-                 site.repository.rugged.head.target.message
+
+    # TODO: Esto requiere que podamos buscar hacia atrás en la historia
+    # del repositorio
+    # assert_equal I18n.t('site_service.create', name: name),
+    #             site.repository.rugged.head.target.message
+
+    I18n.available_locales.each do |locale|
+      assert_equal 3, site.posts(lang: locale).size
+    end
 
     site.destroy
   end
diff --git a/test/models/post_test.rb b/test/models/post_test.rb
index b52f5d9c..996a0263 100644
--- a/test/models/post_test.rb
+++ b/test/models/post_test.rb
@@ -42,6 +42,8 @@ class PostTest < ActiveSupport::TestCase
 
       if metadata.empty?
         assert_not @post.document.data[attr.to_s].present?
+      elsif metadata.type == :lang
+        assert @post.path.relative.starts_with?("_#{metadata.value}/")
       elsif @post.document.respond_to? attr
         assert_equal metadata.value, @post.document.send(attr), attr
       else
diff --git a/test/models/site_test.rb b/test/models/site_test.rb
index 817613db..78e3f577 100644
--- a/test/models/site_test.rb
+++ b/test/models/site_test.rb
@@ -60,7 +60,7 @@ class SiteTest < ActiveSupport::TestCase
   end
 
   test 'se puede leer un sitio' do
-    site = create :site, name: 'sutty.nl'
+    site = create :site
 
     assert site.valid?
     assert !site.posts.empty?
@@ -87,10 +87,10 @@ class SiteTest < ActiveSupport::TestCase
   end
 
   test 'el sitio tiene artículos en distintos idiomas' do
-    site = create :site, name: 'sutty.nl'
+    @site = create :site
 
     I18n.available_locales.each do |locale|
-      assert site.posts(lang: locale).size.positive?
+      assert @site.posts(lang: locale).size.positive?
     end
   end
 end
diff --git a/test/test_helper.rb b/test/test_helper.rb
index cf139953..c9fda066 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -5,6 +5,8 @@ require 'rails/test_help'
 require 'open3'
 require 'sucker_punch/testing/inline'
 
+Rails.application.load_seed
+
 # rubocop:disable Style/ClassAndModuleChildren
 class ActiveSupport::TestCase
   include FactoryBot::Syntax::Methods