l10n: git.pot: proposed updates since v1.8.4 (48+)

Holds proposed updates of l10n for Git next release (1.8.5), and
will be rewound when there are remarkable updates for "po/git.pot"
until the release of v1.8.5-rc1.

Translators can work on this progressively update branch (pu),
instead of starting to translate one giant update of "po/git.pot".
Because this branch will be rewound occasionally, translators
SHOULD NOT merge, but should rebase to this rewound bransh instead.

    $ git fetch git://github.com/git-l10n/git-po.git pu
    $ git rebase --onto FETCH_HEAD HEAD~1

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