[bug-gettext] Python 3 format strings

[Daiki Ueno]

Hi,

I've rebased the Python 3 braced format patch[1] and pushed it to
'python-brace-format' branch:
http://git.savannah.gnu.org/cgit/gettext.git/log/?h=python-brace-format
so it can be easily tested.

Footnotes: 
[1]  https://lists.gnu.org/archive/html/bug-gettext/2012-12/msg00028.html

Regards,
-- 
Daiki Ueno