code: def register_blueprint(self, blueprint, register_with_babel=True, **options):
          
          if self.unchained.babel_bundle and register_with_babel:
              self.unchained.babel_bundle.register_blueprint(self, blueprint, **options)
          return super().register_blueprint(blueprint, **options)
docs: Like :meth:`~flask.Flask.register_blueprint`, but if ``register_with_babel``
          is True, then we also allow the Babel Bundle an opportunity to register language
          code prefixed URLs.