let admin/announcement works

app/models/announcement.rb

@@ -3,11 +3,20 @@ class Announcement
    include MongoMapper::Document
    
    key :title_en, String
+   key :title_zh_tw, String
    key :content_en, String
    key :content_zh_tw, String
    
    def to_liquid
-     { "id" => self.id, "title" => self.title, "content" => self.content }
+     { "id" => self.id, "title" => self.send("title_#{I18n.locale}"), "content" => self.send("content_#{I18n.locale}") }
+   end
+    
+   def title
+     self.send("title_#{I18n.locale}")
+   end
+    
+   def content
+     self.send("content_#{I18n.locale}")
    end
    
 end