code: def validate_unique(self):
          
          form_errors = []
          try:
              super(LocalisedForm, self).validate_unique()
          except ValidationError as e:
              form_errors += e.messages
  
          # add unique validation for the localized fields.
          localized_fields_checks = self._get_localized_field_checks()
          bad_fields = set()
  
          field_errors, global_errors = self._perform_unique_localized_field_checks(localized_fields_checks)
          bad_fields.union(field_errors)
          form_errors.extend(global_errors)
          
          for field_name in bad_fields:
              del self.cleaned_data[field_name]
          if form_errors:
              # Raise the unique together errors since they are considered
              # form-wide.
              raise ValidationError(form_errors)
docs: Validates the uniqueness of fields, but also handles the localized_fields.