Fix sanitization for translatable description attribute

Move method from sanitizable to globalizable concern because
globalize_accessors were overiding sanitizable method and was never
called. Another solution to this could be to load sanitizable
always after globalizable concern.

Old method implementation was not working well with globalize_accessors,
it was returning nil always.

app/models/concerns/globalizable.rb

@@ -12,6 +12,10 @@ module Globalizable
     def assign_model_to_translations
       translations.each { |translation| translation.globalized_model = self }
     end
+
+    def description
+      self.read_attribute(:description).try :html_safe
+    end
   end
 
   class_methods do