Update information texts translatable fields

This part used the code we deleted in order to make it easier to
refactor the rest of the translatable models. Now we add the code back.

app/controllers/admin/site_customization/information_texts_controller.rb

@@ -1,5 +1,5 @@
 class Admin::SiteCustomization::InformationTextsController < Admin::SiteCustomization::BaseController
-  include Translatable
+  before_action :delete_translations, only: [:update]
 
   def index
     fetch_existing_keys
@@ -9,7 +9,7 @@ class Admin::SiteCustomization::InformationTextsController < Admin::SiteCustomiz
 
   def update
     content_params.each do |content|
-      values = content[:values].slice(*translation_params(I18nContent))
+      values = content[:values].slice(*translation_params)
 
       unless values.empty?
         values.each do |key, value|
@@ -73,4 +73,15 @@ class Admin::SiteCustomization::InformationTextsController < Admin::SiteCustomiz
       end
     end
 
+    def translation_params
+      I18nContent.translated_attribute_names.product(enabled_translations).map do |attr_name, loc|
+        I18nContent.localized_attr_name_for(attr_name, loc)
+      end
+    end
+
+    def enabled_translations
+      params.fetch(:enabled_translations, {})
+            .select { |_, v| v == '1' }
+            .keys
+    end
 end