MDL-40759 fontawesome: Fix section highlighting

The section highlighting code was re-written in parallel to font-awesome - so we need
to apply the same font-awesome tweaks here now.

Author: Damyon Wiese

course/amd/build/actions.min.js

@@ -355,15 +355,22 @@ define(['jquery', 'core/ajax', 'core/templates', 'core/notification', 'core/str'
          */
         var replaceActionItem = function(actionitem, image, stringname,
                                            stringcomponent, titlestr, titlecomponent, newaction) {
-            actionitem.find('img').attr('src', url.imageUrl(image, 'core'));
+
             str.get_string(stringname, stringcomponent).done(function(newstring) {
                 actionitem.find('span.menu-action-text').html(newstring);
                 actionitem.attr('title', newstring);
             });
             if (titlestr) {
-                str.get_string(titlestr, titlecomponent).done(function(newtitle) {
+                str.get_string(titlestr, titlecomponent).then(function(newtitle) {
+                    templates.renderPix(image, 'core', newtitle).then(function(html) {
+                        actionitem.find('.icon').replaceWith(html);
+                    });
                     actionitem.attr('title', newtitle);
                 });
+            } else {
+                templates.renderPix(image, 'core', '').then(function(html) {
+                    actionitem.find('.icon').replaceWith(html);
+                });
             }
             actionitem.attr('data-action', newaction);
         };
@@ -591,4 +598,4 @@ define(['jquery', 'core/ajax', 'core/templates', 'core/notification', 'core/str'
                 replaceActionItem(actionitem, image, stringname, stringcomponent, titlestr, titlecomponent, newaction);
             }
         };
-    });
+    });