l10n: zh_CN.po: translate 323 new messages

Update Simplified Chinese translation for 134 fuzzy, 189 new messages
from Git v1.7.10.2-548-g9de96.
Signed-off-by: NJiang Xin <worldhello.net@gmail.com>
Signed-off-by: NZhuang Ya <zhuangya@me.com>