let page model support i18n

app/models/page.rb

@@ -1,8 +1,14 @@
 class Page < CouchFoo::Base
   
+   property :lang, String
    property :name, String
    property :parent_page_id, String
-   property :content, String
+   
+   property :content_zh_tw, String
+   property :content_en, String
+   property :content_ja, String
+   # TODO: more language can dynamic added
+   
    property :layout_id, String
    property :layout_name, String
    property :use_engine, String