glib-2.0: add binding for g_get_language_names()
glib-2.0: add binding for g_get_language_names()

Adding to the Intl namespace, as its documentation is listed in the
"Internationalization" section of the GLib docs.

Fixes GNOME bug #596456.

flobrosch/vala-fixes,severinh/vala,lovebug356/vala,spidermonkdust/vala,themiwi/vala,flobrosch/vala-fixes,playya/vala,frida/vala,frida/vala,Distrotech/vala,GNOME/vala,severinh/vala,jessevdk/vala,GNOME/vala,tjol/vala-tjol,rvu95/vala,themiwi/vala,themiwi/vala,kamanashisroy/aroop,Jc2k/vala,jessevdk/vala,Jc2k/vala,GNOME/vala,spidermonkdust/vala,phako/vala,severinh/vala,jessevdk/vala,frida/vala,tjol/vala-tjol,Distrotech/vala,flobrosch/vala-fixes,playya/vala,xdave/pvala,kamanashisroy/aroop,frida/vala,phako/vala,playya/vala,rvu95/vala,Distrotech/vala,rvu95/vala,tjol/vala-tjol,lovebug356/vala,frida/vala,spidermonkdust/vala,kamanashisroy/aroop,GNOME/vala