Get language list from AccountsService's dbus (#973)
Get language list from AccountsService's dbus (#973)

* Get language list from AccountsService's dbus

Fixes issue #950

When xa.languages is not set in repo config, system installs will
get language list from AccountsService's dbus.

matthiasclasen/flatpak,handsome-feng/flatpak,flatpak/flatpak,matthiasclasen/flatpak,handsome-feng/flatpak,handsome-feng/flatpak,matthiasclasen/flatpak,flatpak/flatpak,handsome-feng/flatpak,handsome-feng/flatpak,flatpak/flatpak,matthiasclasen/flatpak,flatpak/flatpak,matthiasclasen/flatpak,flatpak/flatpak