Improve Lightbox accessibility.

themes/bootstrap3/js/lightbox.js

@@ -7,7 +7,7 @@ VuFind.register('lightbox', function Lightbox() {
   var refreshOnClose = false;
   var _modalParams = {};
   // Elements
-  var _modal, _modalBody, _clickedButton = null;
+  var _modal, _modalBody, _modalTitle, _clickedButton = null;
   // Utilities
   function _storeClickedStatus() {
     _clickedButton = this;
@@ -386,6 +386,7 @@ VuFind.register('lightbox', function Lightbox() {
   function init() {
     _modal = $('#modal');
     _modalBody = _modal.find('.modal-body');
+    _modalTitle = _modal.find('#modal-title');
     _modal.on('hide.bs.modal', function lightboxHide() {
       if (VuFind.lightbox.refreshOnClose) {
         VuFind.refreshPage();