code: def url_for_token(self, token):
          
          book_url = self.get_config_value("pages", token)
          book, _, url_tail = book_url.partition(':')
          book_base = settings.HELP_TOKENS_BOOKS[book]
  
          url = book_base
  
          lang = getattr(settings, "HELP_TOKENS_LANGUAGE_CODE", None)
          if lang is not None:
              lang = self.get_config_value("locales", lang)
              url += "/" + lang
  
          version = getattr(settings, "HELP_TOKENS_VERSION", None)
          if version is not None:
              url += "/" + version
  
          url += "/" + url_tail
          return url
docs: Find the full URL for a help token.