feat(downloadData): remove "release candidate" label

Author: petebacondarwin

src/js/download-data.js

@@ -3,16 +3,10 @@ angular.module('download-data', [])
 .value('BRANCHES', [
     {
       branch: '1.6.*', version: '${CDN_VERSION_1_6}',
-      title: '1.6.x (release candidate)',
+      title: '1.6.x (latest)',
       cssClass: 'branch-1-6-x',
       showOnButton: true
     },
-    {
-      branch: '1.5.*', version: '${CDN_VERSION_1_5}',
-      title: '1.5.x (stable)',
-      cssClass: 'branch-1-5-x',
-      showOnButton: true
-    },
     {
       branch: '1.2.*', version: '${CDN_VERSION_1_2}',
       title: '1.2.x (legacy)',