diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 85e969cb..0aca486c 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -26,7 +26,7 @@ class ApplicationController < ActionController::Base
 
   def find_post(site)
     id = params[:post_id] || params[:id]
-    lang = find_lang
+    lang = find_lang(site)
     posts = site.posts_for(lang)
 
     posts.find do |p|
@@ -34,8 +34,15 @@ class ApplicationController < ActionController::Base
     end
   end
 
-  def find_lang
-    params.fetch(:lang, I18n.locale.to_s)
+  def find_lang(site)
+    params.fetch(:lang, site.default_lang)
+  end
+
+  def find_template(site)
+    id = params[:template_id] || params[:id]
+    site.templates.find do |t|
+      t.id == id
+    end
   end
 
   def set_locale
diff --git a/app/controllers/posts_controller.rb b/app/controllers/posts_controller.rb
index 72b3967d..610e6565 100644
--- a/app/controllers/posts_controller.rb
+++ b/app/controllers/posts_controller.rb
@@ -2,8 +2,8 @@ class PostsController < ApplicationController
   before_action :authenticate!
 
   def index
-    @lang     = find_lang
     @site     = find_site
+    @lang     = find_lang(@site)
     @category = session[:category] = params.dig(:category)
     @posts    = @site.posts_for(@lang)
 
@@ -15,20 +15,20 @@ class PostsController < ApplicationController
   end
 
   def show
-    @lang = find_lang
     @site = find_site
+    @lang = find_lang(@site)
     @post = find_post(@site)
   end
 
   def new
-    @lang = find_lang
     @site = find_site
+    @lang = find_lang(@site)
     @post = Post.new(site: @site, front_matter: { date: Time.now }, lang: @lang)
   end
 
   def create
-    @lang = find_lang
     @site = find_site
+    @lang = find_lang(@site)
     @post = Post.new(site: @site, front_matter: post_params.to_hash, lang: @lang)
 
     if @post.save
@@ -39,15 +39,15 @@ class PostsController < ApplicationController
   end
 
   def edit
-    @lang = find_lang
     @site = find_site
+    @lang = find_lang(@site)
     @post = find_post(@site)
   end
 
   def update
     p = post_params
-    @lang = find_lang
     @site = find_site
+    @lang = find_lang(@site)
     @post = find_post(@site)
 
     @post.update_attributes(p)
diff --git a/app/models/site.rb b/app/models/site.rb
index 612bf9f0..71a82598 100644
--- a/app/models/site.rb
+++ b/app/models/site.rb
@@ -13,7 +13,36 @@ class Site
 
   # Determina si el sitio está en varios idiomas
   def i18n?
-    @jekyll.config.dig('i18n').present?
+    !translations.empty?
+  end
+
+  # Obtiene la lista de traducciones actuales
+  def translations
+    @jekyll.config.dig('i18n') || []
+  end
+
+  # Devuelve el idioma por defecto del sitio
+  #
+  # TODO: volver elegante
+  def default_lang
+    # Si está traducido, intentamos saber si podemos trabajar en el
+    # idioma actual de la plataforma.
+    if i18n?
+      i18n = I18n.locale.to_s
+      if translations.include? i18n
+        # Podemos trabajar en el idioma actual
+        i18n
+      else
+        # Sino, trabajamos con el primer idioma
+        translations.first
+      end
+    else
+      # Si el sitio no está traducido, estamos trabajando con posts en
+      # cualquier idioma
+      #
+      # XXX: no será un dirty hack?
+      'posts'
+    end
   end
 
   # Obtener el nombre del sitio
diff --git a/app/views/posts/_form.haml b/app/views/posts/_form.haml
index e5264a2b..543b05de 100644
--- a/app/views/posts/_form.haml
+++ b/app/views/posts/_form.haml
@@ -115,14 +115,15 @@
       options_for_select(@site.everything_of(:materiales_requeridos, lang: @lang), @post.get_front_matter(:materiales_requeridos)),
       { class: 'form-control select2', multiple: 'multiple' }
     %small.text-muted.form-text= t('posts.materiales_requeridos_help')
-  - I18n.available_locales.map(&:to_s).each do |lang|
-    - next if lang == @lang
-    .form-group
-      = label_tag 'post_lang', t("posts.lang.#{lang}")
-      = select_tag "post[lang][#{lang}]",
-        options_for_select(@site.posts_for(lang).map { |p| [p.title, p.id] },
-        @post.get_front_matter(:lang).try(:dig, lang)),
-        { class: 'form-control select2' }
-      %small.text-muted.form-text= t('posts.lang_help')
+  - if @site.i18n?
+    - @site.translations.each do |lang|
+      - next if lang == @lang
+      .form-group
+        = label_tag 'post_lang', t("posts.lang.#{lang}")
+        = select_tag "post[lang][#{lang}]",
+          options_for_select(@site.posts_for(lang).map { |p| [p.title, p.id] },
+          @post.get_front_matter(:lang).try(:dig, lang)),
+          { class: 'form-control select2' }
+        %small.text-muted.form-text= t('posts.lang_help')
   .form-group
     = submit_tag t('posts.save'), class: 'btn btn-success'
diff --git a/app/views/posts/index.haml b/app/views/posts/index.haml
index 84e32a8d..6c99649e 100644
--- a/app/views/posts/index.haml
+++ b/app/views/posts/index.haml
@@ -12,7 +12,7 @@
     .btn-group
       = link_to t('posts.new'), new_site_post_path(@site, lang: @lang),
         class: 'btn btn-success'
-      - I18n.available_locales.map(&:to_s).each do |l|
+      - @site.translations.each do |l|
         = link_to t("i18n.#{l}"), site_posts_path(@site, category: @category, lang: l),
           class: 'btn btn-info'