GNOME connection manager
Installation
Install either gnome-connection-manager-binAUR package.
Language
GCM should use the default OS language, but if for any reason you want to use another language, then start GCM this way:
$ LANG=en_US.UTF.8 /usr/share/gnome-connection-manager/gnome_connection_manager.py
replace en_US.UTF-8 with the language of your choice.