Add Chinese translation

Signed-off-by: qiansen1386 <qiansen1386@gmail.com>
polish the Translation
Continue to polish chinese Translation. Fix all the issue mentioned by @samdark. Removed all comments.

Signed-off-by: qiansen1386 <qiansen1386@gmail.com>
Polish Chinese translation. Symbols

Signed-off-by: qiansen1386 <qiansen1386@gmail.com>
Correction of chinese core message translation.

Signed-off-by: qiansen1386 <qiansen1386@gmail.com>
Update yii.php
Merge pull request #1867 from qiansen1386/master

Add Chinese translation