Added error handling to lightbox ajax load.

themes/bootstrap3/js/lightbox.js

@@ -114,6 +114,9 @@ VuFind.lightbox = (function() {
           }
         }
         _update(html);
+      })
+      .fail(function() {
+        showAlert(VuFind.translate('error_occurred'), 'danger');  
       });
     return _xhr;
   };

themes/bootstrap3/templates/layout/layout.phtml

@@ -34,6 +34,7 @@
             'bulk_noitems_advice' => 'bulk_noitems_advice',
             'bulk_save_success' => 'bulk_save_success',
             'close' => 'close',
+            'error_occurred' => 'An error has occurred',
             'go_to_list' => 'go_to_list',
             'libphonenumber_invalid' => 'libphonenumber_invalid',
             'libphonenumber_invalidcountry' => 'libphonenumber_invalidcountry',