code: def update(domain):
      
      translations_dir = _get_translations_dir()
      domain = _get_translations_domain(domain)
      pot = os.path.join(translations_dir, f'{domain}.pot')
      return _run(f'update -i {pot} -d {translations_dir} --domain={domain}')
docs: Update language-specific translations files with new keys discovered by
      ``flask babel extract``.