code: def register(model_or_iterable, **options):
      
      from modeltranslation.translator import translator, TranslationOptions
  
      def wrapper(opts_class):
          if not issubclass(opts_class, TranslationOptions):
              raise ValueError('Wrapped class must subclass TranslationOptions.')
          translator.register(model_or_iterable, opts_class, **options)
          return opts_class
  
      return wrapper
docs: Registers the given model(s) with the given translation options.
  
      The model(s) should be Model classes, not instances.
  
      Fields declared for translation on a base class are inherited by
      subclasses. If the model or one of its subclasses is already
      registered for translation, this will raise an exception.
  
      @register(Author)
      class AuthorTranslation(TranslationOptions):
          pass