code: def language(self, lang):
          
          lang = lang.lower()
          if self._lang == lang:
              return
  
          url = self._api_url
          tmp = url.replace("/{0}.".format(self._lang), "/{0}.".format(lang))
  
          self._api_url = tmp
          self._lang = lang
          self.clear_memoized()
docs: Set the language to use; attempts to change the API URL