@classmethod
def get_model_title_plural(cls):
    """
        Return a "humanized" (and plural) version of the model name, for
        display in templates.
        """
    if hasattr(cls, 'model_title_plural'):
        return cls.model_title_plural
    try:
        return cls.get_model_class().get_model_title_plural()
    except (NotImplementedError, AttributeError):
        return '{}s'.format(cls.get_model_title())
