Added mailer i18n (#436)

* Added mailer i18n

* Added translation to mailer in the JS

Also added a generic way to add JS translation through a javascript entry in the locale file

* Moved line-breaks from translations to JS file

app/helpers/application_helper.rb

@@ -89,4 +89,10 @@ module ApplicationHelper
       false
     end
   end
+
+  # Return all the translations available in the client side through javascript
+  def current_translations
+    @translations ||= I18n.backend.send(:translations)
+    @translations[I18n.locale].with_indifferent_access[:javascript] || {}
+  end
 end