code: 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
docs: Find out what the fallback language is for a given language choice.
  
          .. deprecated:: 1.5
             Use :func:`get_fallback_languages` instead.