docs: function linkLocales() {
      return listFiles('locales')
          .then(filter(test(/^[a-z]{2}(_[A-Z]{2,3})?\.json$/)) & map(path.join('locales', _)))
          .filter(location => fs.readFileAsync(location)
              .then(JSON.parse & is(Object))
              .catchReturn(false))
          .catchReturn([]);
  }