code: def save_translations(self, instance, translated_data):
          
          for meta in self.Meta.model._parler_meta:
              translations = translated_data.get(meta.rel_name, {})
              for lang_code, model_fields in translations.items():
                  translation = instance._get_translated_model(lang_code, auto_create=True, meta=meta)
                  for field, value in model_fields.items():
                      setattr(translation, field, value)
  
          # Go through the same hooks as the regular model,
          # instead of calling translation.save() directly.
          instance.save_translations()
docs: Save translation data into translation objects.