Remove any mention of TU Graz.

Since this is very simple JS code and we can't adjust it with
slots etc. just remove the support text.

It's nice to have to aborting requests and adding timeouts to them.
This is in theory supported in all browsers covered by other checks,
but Safari 11.x had a broken implementation.

Fixes #38

This should be used by every app, so move it here to avoid duplication.