Fix breadcrumb display so it does not include parent node texts

EDUCATOR-1549

lms/djangoapps/discussion/static/discussion/js/views/discussion_board_view.js

@@ -277,14 +277,18 @@
             getBreadcrumbText: function($item) {
                 var $parentSubMenus = $item.parents('.forum-nav-browse-submenu'),
                     crumbs = [],
-                    subTopic = $('.forum-nav-browse-title', $item)
-                        .first()
+                    subTopic = $(
+                            $('.forum-nav-browse-title', $item)
+                                .first().contents().last()
+                        )
                         .text()
                         .trim();
 
                 $parentSubMenus.each(function(i, el) {
-                    crumbs.push($(el).siblings('.forum-nav-browse-title')
-                        .first()
+                    crumbs.push($(
+                            $(el).siblings('.forum-nav-browse-title')
+                                .first().contents().last()
+                        )
                         .text()
                         .trim()
                     );