def get_fallback_language(self, language_code=None, site_id=None):
        choices = self.get_active_choices(language_code, site_id=site_id)
        if choices and len(choices) > 1:
            # Still take the last, like previous code.
            # With multiple fallback languages that means taking the base language.
            # Hence, upgrade the code to use get_fallback_languages() instead.
            return choices[-1]
        else:
            return None
Find out what the fallback language is for a given language choice.
dataset/ETHPy150Open edoburu/django-parler/parler/utils/conf.py/LanguagesSetting.get_fallback_language