build: Migrate from Intltool to Gettext

Recent versions of Gettext are able to translate several formats
that are used in GNOME applications.

This migrates from Intltool to Gettext both autotools and meson
build systems.
1 job for gettext in 1 minute and 39 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Test
passed #5259486
build_stable

00:01:39