fix error

app/models/bulletin_feed.rb

@@ -55,7 +55,7 @@ class BulletinFeed
       tags = bf.tag_ids
       categories = bf.category_ids
       if !(categories.empty? && tags.empty?)
-        anns_before_filter = Bulletin.any_of([{"title.en"=>{"$nin"=>["", nil]}},{"title.zh_tw"=>{"$nin"=>["", nil]}}]).is_approved_and_show
+        anns_before_filter = Bulletin.any_of(I18n.available_locales.map{|v| {"title.#{v}"=>{"$nin"=>["", nil]}}}).is_approved_and_show
         if !dt.nil?
           dt = DateTime.parse(dt)
           dtt = dt + 1.day