Adapt to new gjs interface

Also bump the gjs dependency to 1.36.0. The dependency is in
reality even higher but gjs has unfortunately not bumped its
version since the interface changed.

https://bugzilla.gnome.org/show_bug.cgi?id=699950
Fix tests after glib string change

The strings used to use `really dumb quote' and now use
'dumb quotes'.

https://git.gnome.org/browse/glib/commit/?id=4b94c0831e449374ce769cb4938a28b3dca59a43