Hi Jelmer,
It looks like the automatic edit of debian/watch made it uneffective.
Please have a look at this one "python-setuptools-gettext" package
and thanks again for lintian-brush.
https://pypi.debian.net/setuptools-gettext
This is the prefered Pypi template for v5 d/watch;
it seems not to handle all the corner cases well yet:
things about uppercase -> lowercase mangling,
the '-' -> '_' change in Pypi archive naming policy.
I think that if you stumble on this too,
the fix would be in "devscripts" then.
Greetings
Alexandre