code: def _get_languages(cls) -> set:
          
          if not cls._server_is_alive():
              cls._start_server_on_free_port()
          url = urllib.parse.urljoin(cls._url, 'Languages')
          languages = set()
          for e in cls._get_root(url, num_tries=1):
              languages.add(e.get('abbr'))
              languages.add(e.get('abbrWithVariant'))
          return languages
docs: Get supported languages (by querying the server).