code: def all_languages_column(self, object):
          
          all_languages = [code for code, __ in settings.LANGUAGES]
          return mark_safe(
              self._languages_column(
                  object, all_languages, span_classes='all-languages'
              )
          )
docs: The language column which can be included in the ``list_display``.
          It also shows untranslated languages