i18n zh_cn

[Dongsheng Song]

> I just find another file. maybe someone'd find it useful.

Don't impatient, we much care about veracity, not the progress.
Your po file give about 100 new messages, but lots of not correct.

e.g.
msgid "svn: start revision is not supported with more than one branch"
msgstr "svn: 开始版本不能有多个分支"

should be:

msgid "svn: start revision is not supported with more than one branch"
msgstr "svn: 有多个分支时不支持开始版本"

If you want to contribute, please give me small diffs for review.

--
Dongsheng Song