git-gui: translate the remaining messages in zh_cn.po to chinese
'make' shows:
MSGFMT po/zh_cn.msg 368 translated, 2 fuzzy, 1 untranslated message.
1. update the zh_cn.po and translate the remaining messages in chinese
2. correct some of the previously mis-translated messages
3. add a list of word interpretation in the head as a guideline for
subsequent updatings and translations
Signed-off-by: eric miao <eric.miao@marvell.com>
Acked-by: Xudong Guan <xudong.guan@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>