po/pl.po: update Polish translation for 4.15.0

Polish translation update for xfsprogs 4.15.0

Signed-off-by: Jakub Bogusz <qboosh@pld-linux.org>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>

1 file changed