Comment 2 for bug 1769774

I'm pretty sure that you are tripping over the fact that terminator is gtk3 and checks in the gnome standard location. I'm not sure if xfce attempts to set the right fonts for the various desktops (i.e. gnome gtk2 and gtk3, kde, etc). I would argue that it is better to have the desktop set these values, rather than have every application trying to detect every desktop and parse their various ways of setting default fonts.