l10n: zh_CN.po: translate 4 new messages
l10n: zh_CN.po: translate 4 new messages

Translate 4 new messages came from git.pot update in 0bbe5b4
(l10n: Update git.pot (4 new, 3 removed messages))

Signed-off-by: Jiang Xin <61b5e6324abee2d58ba2cf49f31c723faf6fd946@gmail.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git