l10n: zh_CN.po: 800+ new translations on command usages

Most of the 800+ new translations are contributed by Wang Sheng.
So he is a zh_CN l10n maintainer for Git now.

Also fixed translations for some terms, such as blob, dangling.
Signed-off-by: NWang Sheng <wangsheng2008love@163.com>
Signed-off-by: NJiang Xin <worldhello.net@gmail.com>

po/TEAMS

@@ -46,3 +46,4 @@ Members:	Riku <lu.riku AT gmail.com>
 		Yichao Yu <yyc1992 AT gmail.com>
 		ws3389 <willsmith3389 AT gmail.com>
 		Thynson <lanxingcan AT gmail.com>
+		Wang Sheng <wangsheng2008love@163.com>