[L10N] Kickoff for Git 2.30.0 round #1

Hi,

Git v2.30.0-rc0 has been released, and it's time to start new round of
git l10n.  This time there are 70 updated messages need to be translated
since last update.  Let's start a new round of git l10n based on this
commit:

    l10n: git.pot: v2.30.0 round 1 (70 new, 45 removed)
    
    Generate po/git.pot from v2.30.0-rc0 for git v2.30.0 l10n round 1.
    
    Signed-off-by: Jiang Xin [off-list ref]

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