message: Added navigation title and description to progress buttons markup
diff: <ul data-bind="css: model.css.progressButtonsList">
  <!-- ko foreach: model.visiblePages -->
  <li>
  - <span data-bind="text: name"></span>
  + <span data-bind="text: navigationTitle || name"></span>
  + <br>
  + <span data-bind="text: navigationDescription"></span>
  </li>
  <!-- /ko -->
  </ul>
  