autotools: Fix Gettext files installation

Gettext files are not installed in autotools. This has been fixed
so they are now installed properly.
3 jobs for improve-dir-install in 8 minutes and 43 seconds (queued for 2 seconds)
latest
Status Name Job ID Coverage
  Test
passed flatpak #259981

00:05:46

 
  Review
passed review #259982

00:02:56

manual stop_review #259983
allowed to fail manual