also support archlinux in __locale

Signed-off-by: Nico Schottelius <nico@bento.schottelius.org>
++changes

Signed-off-by: Nico Schottelius <nico@bento.schottelius.org>
update changelog / release date

Signed-off-by: Nico Schottelius <nico@bento.schottelius.org>