The very first login screen should warn about creating a superuser

Upon a fresh install, the first user who logs in is going to become an admin. The old hue shows a warning about it. Is there a way to port this over as well? It seems like a useful thing for admins to know.

To simulate a fresh install:
$ mv desktop/desktop.db

{,.old}

$ build/env/bin/hue syncdb --noinput