[L10N] Kickoff for Git 2.13.0 l10n round 2

[Jiang Xin]

Hi,

Git v2.13.0-rc2 introduced 4 new messages, let's start round 2 for Git
2.13.0 l10n.

You can get it from the usual place:

    https://github.com/git-l10n/git-po/

As how to update your XX.po and help to translate Git, please see
"Updating a XX.po file" and other sections in “po/README" file.

--
Jiang Xin