code: def save_new(self, form, commit=True):
          
          kwargs = {self.fk.get_attname(): self.instance.pk}
          new_obj = self.model(**kwargs)
          self._prepare_multilingual_object(new_obj, form)
          return forms.save_instance(form, new_obj, exclude=[self._pk_field.name], commit=commit)
docs: NOTE: save_new method is completely overridden here, there's no
          other way to pretend double save otherwise. Just assign translated data
          to object