add subtitle_ann for front-end

app/controllers/announcements_controller.rb

@@ -342,6 +342,7 @@ class AnnouncementsController < ApplicationController
       "bulletin_links" => links,
       "data" => {
         "title" => announcement.title,
+        "subtitle_ann" => announcement.subtitle,
         "update_user" => update_user,
         "updated_at" => announcement.postdate.strftime('%Y-%m-%d %H:%M'),
         "body" =>announcement.text,