function _get_path_to_translation_from_lang_dir( $domain ) {
  static $cached_mofiles = null;

  if ( null === $cached_mofiles ) {
    $cached_mofiles = array();

    $locations = array(
      WP_LANG_DIR . '/plugins',
      WP_LANG_DIR . '/themes',
    );

    foreach ( $locations as $location ) {
      $mofiles = glob( $location . '/*.mo' );
      if ( $mofiles ) {
        $cached_mofiles = array_merge( $cached_mofiles, $mofiles );
      }
    }
  }

  $locale = is_admin() ? get_user_locale() : get_locale();
  $mofile = "{$domain}-{$locale}.mo";

  $path = WP_LANG_DIR . '/plugins/' . $mofile;
  if ( in_array( $path, $cached_mofiles ) ) {
    return $path;
  }

  $path = WP_LANG_DIR . '/themes/' . $mofile;
  if ( in_array( $path, $cached_mofiles ) ) {
    return $path;
  }

  return false;
}