Add zh_CN translation.
Add zh_CN translation.

RavenB/commafeed,Athou/commafeed,ahmadassaf/CommaFeed-RSS-Reader,RavenB/commafeed,Hubcapp/commafeed,wesley1001/commafeed,RavenB/commafeed,zhangzuoqiang/commafeed,wesley1001/commafeed,ebraminio/commafeed,Hubcapp/commafeed,wesley1001/commafeed,Athou/commafeed,ebraminio/commafeed,ahmadassaf/CommaFeed-RSS-Reader,syshk/commafeed,wesley1001/commafeed,zhangzuoqiang/commafeed,ahmadassaf/CommaFeed-RSS-Reader,syshk/commafeed,Athou/commafeed,syshk/commafeed,ebraminio/commafeed,ebraminio/commafeed,ahmadassaf/CommaFeed-RSS-Reader,Hubcapp/commafeed,syshk/commafeed,zhangzuoqiang/commafeed,RavenB/commafeed,Hubcapp/commafeed,Athou/commafeed,zhangzuoqiang/commafeed