proof translation and fix the link for Chinese translation [skip ci]

Fixed some issues and changed some terms to be used for consistency. 
啊，对。只注意文档标题了，我的错。你方便去 yii-chinesization/yii2 里改一下么？还有哪里你觉得改得不好的，请一并修改掉。我给你下权限。