build: Migrate from Intltool to Gettext
Recent versions of Gettext are able to translate several formats that are used in GNOME applications. This patch migrates from Intltool to Gettext by using meson's i18n features.
Recent Gettext versions when used along with autotools, also make
use of PACKAGE
and VERSION
variables. Due to this the domain has been changed to use the value from PACKAGE
.