l10n: zh_CN.po: translate 5 messages (2135t0f0u)

Translate 5 new messages came from git.pot update in b8ecf23
(l10n: git.pot: v1.8.4 round 2 (5 new, 3 removed)).

Signed-off-by: Jiang Xin <[email protected]>

Author: jiangxin