old_contents: # -*- coding: utf-8 -*-
  
  from __future__ import unicode_literals
  
  from cms.utils.i18n import get_current_language
  from parler.managers import TranslatableManager
  
  
  class RelatedManager(TranslatableManager):
  
      def filter_by_language(self, language):
          return self.active_translations(language_code=language).distinct()
  
      def filter_by_current_language(self):
          return self.filter_by_language(get_current_language())
  
  
  class CategoryManager(TranslatableManager):
  
      def get_categories(self, language=None):
          categories = self.active_translations(
              language_code=language).distinct().prefetch_related('questions')
  
          for category in categories:
              category.count = (category.questions
              .filter_by_language(language).count())
          return sorted(categories, key=lambda x: -x.count)
  
new_contents: # -*- coding: utf-8 -*-
  
  from __future__ import unicode_literals
  
  from cms.utils.i18n import get_current_language
  from parler.managers import TranslatableManager
  
  
  class RelatedManager(TranslatableManager):
  
      def filter_by_language(self, language):
          return self.active_translations(language_code=language)
  
      def filter_by_current_language(self):
          return self.filter_by_language(get_current_language())
  
  
  class CategoryManager(TranslatableManager):
  
      def get_categories(self, language=None):
          categories = self.active_translations(
              language_code=language).prefetch_related('questions')
  
          for category in categories:
              category.count = (category.questions
              .filter_by_language(language).count())
          return sorted(categories, key=lambda x: -x.count)
  
subject: Remove distinct() here