Add enhanced announcements notification dot feature

This change adds a new option which consists of the injection of custom
CSS code to enhance the announcements notification dot shown in the
hamburger icon in the Community Console.

Change-Id: I6963017d25ba99f82ccabfde8eae45fa3280c4ec
diff --git a/src/_locales/en/messages.json b/src/_locales/en/messages.json
index 65b2640..407ba5c 100644
--- a/src/_locales/en/messages.json
+++ b/src/_locales/en/messages.json
@@ -95,6 +95,10 @@
     "message": "Enable the <code class=\"help\" title=\"This experiment lets you sort the Community Console thread list in ascending or descending order.\">SMEI_SORT_DIRECTION</code> experiment.",
     "description": "Feature checkbox in the options page"
+  "options_enhancedannouncementsdot": {
+    "message": "Show the announcements notification dot more prominently in the Community Console.",
+    "description": "Feature checkbox in the options page"
+  },
   "options_profileindicator_header": {
     "message": "Indicator dot",
     "description": "Heading for the profile indicator feature options"