glib2 will use native libs to print dates

glib2 will use native libs to print dates when this change occurred. After glibc update (AKA libc6), it will be a great improvement in GNOME, but also in other desktop environments like XFCE or MATE, because they also use glib2 to display dates.

Translators should update their translations where needed, and developers adapt their code (minor changes needed, or none).