code: def is_youtube_subtitle_file_supported_language(language):
      
      language_obj = _get_language_with_alpha2_fallback(language)
      if language_obj is None:
          config.LOGGER.warning("Found unsupported language code {}".format(language))
          return False
      else:
          return True
docs: Check if the language code `language` (string) is a valid language code in the
      internal language id format `{primary_code}` or `{primary_code}-{subcode}`
      ot alternatively if it s YouTube language code that can be mapped to one of
      the languages in the internal represention.