l10n: zh_CN: updated translation for 2.51

Signed-off-by: Teng Long <dyroneteng@gmail.com>
Reviewed-by: Fangyi Zhou <me@fangyi.io>
Reviewed-by: 依云 <lilydjwg@gmail.com>
Signed-off-by: Jiang Xin <worldhello.net@gmail.com>

Author: dyrone