[BRotondi]

Confirmed also here (sorry, forgot to mention): Simpli fill out the form with a wrong security check, submit again with correct security check (which normally uses less than 15s) -> You get the Phrase noregister (ID: 103207) "Registratin not possible at the moment."

That's also why I would change this to something like

Sorry, you filled out the form so fast, I can't believe, you're human. If I'm wrong: <a href= "javascript:history.back()">return to the form</a>, reload it with F5 and wait at last 15 seconds before submitting it again. Thanks!

Oder in Deutsch:

<p>Ups... Aufgrund der schnellen Formularausf?llung ging mein Add-on davon aus, dass Du kein Mensch bist.</p>
<p>Falls doch: <a href= "javascript:history.back()">Zum Formular zur?ckkehren</a> und dieses mit F5 erneut laden. Vom Laden bis zum Abschicken der Registrierung mindestens 15 Sekunden warten.</p>

Greetings, Bruno