Drupal 8  8.0.2
/var/www/d8/core/misc/announce.js

$('#search-list') .on('itemInsert', function (event, data) { // Insert the new items. $(data.container.el).append(data.items.el); // Announce the change to the page contents. Drupal.announce(Drupal.t(' items added to ', {'': data.items.length, '': data.container.title} )); });