l10n: zh_CN: for git v2.30.0 l10n round 1 and 2

Translate 71 new messages (5037t0f0u) for git 2.30.0.

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

Author: jiangxin