docs: def localize_fieldnames(fields, internationalized_fields):
      """
      Given a list of fields and a list of field names that
      are internationalized, will return a list with
      all internationalized fields properly localized.
      
      >>> from django.utils.translation import activate
      >>> activate('en-us')
      >>> localize_fieldnames(['name', 'title', 'url'], ['title'])
      ['name', 'title_en_us', 'url']
      
      :param fields: A :class:`list` af field names.
      :param internationalized_fields: A list of fields names, these fields are internationalized.
      :rtype: A list with the actual field names that are used in the current language.
      """
      result = []
      lang = get_language()    
      for field in fields:
          if field in internationalized_fields:
              result.append(get_real_fieldname(field, lang))
          else:
              result.append(field)    
      return result