l10n: zh_CN.po: translate 44 messages (2080t0f0u)

Translate 44 new messages came from git.pot update in c6bc7d4
(l10n: git.pot: v1.8.3 round 2 (44 new, 12 removed))

Signed-off-by: Jiang Xin <worldhello.net@gmail.com>