code: def save_translation(self, translation, *args, **kwargs):
          
          if self.pk is None or self._state.adding:
              raise RuntimeError("Can't save translations when the master object is not yet saved.")
  
          # Translation models without any fields are also supported.
          # This is useful for parent objects that have inlines;
          # the parent object defines how many translations there are.
          if translation.pk is None or translation.is_modified:
              if not translation.master_id:  # Might not exist during first construction
                  translation._state.db = self._state.db
                  translation.master = self
              translation.save(*args, **kwargs)
docs: Save the translation when it's modified, or unsaved.
  
          .. note::
  
             When a derived model provides additional translated fields,
             this method receives both the original and extended translation.
             To distinguish between both objects, check for ``translation.related_name``.
  
          :param translation: The translation
          :type translation: TranslatedFieldsModel
          :param args: Any custom arguments to pass to :func:`save`.
          :param kwargs: Any custom arguments to pass to :func:`save`.