Simplify passing the locale to translatable fields

Creating a new form builder might be too much. My idea was so the view
uses more or less the same syntax it would use with Rails' default
builder, and so we can use `text_field` instead of
`translatable_text_field`.

app/helpers/translatable_form_helper.rb

@@ -19,23 +19,10 @@ module TranslatableFormHelper
   end
 
   class TranslatableFormBuilder < FoundationRailsHelper::FormBuilder
-
-    def translatable_text_field(method, options = {})
-      translatable_field(:text_field, method, options)
-    end
-
-    def translatable_text_area(method, options = {})
-      translatable_field(:text_area, method, options)
-    end
-
-    def translatable_cktext_area(method, options = {})
-      translatable_field(:cktext_area, method, options)
-    end
-
     def translatable_fields(&block)
       @object.globalize_locales.map do |locale|
         Globalize.with_locale(locale) do
-          fields_for(:translations, @object.translations.where(locale: locale).first_or_initialize) do |translations_form|
+          fields_for(:translations, @object.translations.where(locale: locale).first_or_initialize, builder: TranslationsFieldsBuilder) do |translations_form|
             @template.concat translations_form.hidden_field(
               :_destroy,
               value: !@template.enable_locale?(@object, locale),
@@ -44,18 +31,25 @@ module TranslatableFormHelper
 
             @template.concat translations_form.hidden_field(:locale, value: locale)
 
-            yield translations_form, locale
+            yield translations_form
           end
         end
       end.join.html_safe
     end
 
+  end
+
+  class TranslationsFieldsBuilder < FoundationRailsHelper::FormBuilder
+    %i[text_field text_area cktext_area].each do |field|
+      define_method field do |attribute, options = {}|
+        super attribute, translations_options(options)
+      end
+    end
+
     private
 
-      def translatable_field(field_type, method, options = {})
-        locale = options.delete(:locale)
-        final_options = @template.merge_translatable_field_options(options, locale)
-        send(field_type, method, final_options)
+      def translations_options(options)
+        @template.merge_translatable_field_options(options, @object.locale)
       end
   end
 end

app/views/admin/banners/_form.html.erb

@@ -28,18 +28,16 @@
   </div>
 
   <div class="row">
-    <%= f.translatable_fields do |translations_form, locale| %>
+    <%= f.translatable_fields do |translations_form| %>
       <div class="small-12 medium-6 column">
-        <%= translations_form.translatable_text_field :title,
-          locale: locale,
+        <%= translations_form.text_field :title,
           placeholder: t("admin.banners.banner.title"),
           data: {js_banner_title: "js_banner_title"},
           label: t("admin.banners.banner.title") %>
       </div>
 
       <div class="small-12 column">
-        <%= translations_form.translatable_text_field :description,
-          locale: locale,
+        <%= translations_form.text_field :description,
           placeholder: t("admin.banners.banner.description"),
           data: {js_banner_description: "js_banner_description"},
           label: t("admin.banners.banner.description")  %>