Set delay before accepting new requests from same browser

[Popolechien]

I started an order but nothing appeared or changed for a couple of seconds after clicking Let's zim it!. I clicked a couple more times and now I end up with 5 identical orders being accepted. Maybe there should be a delay that prevents users from launching successive orders during a short timespan.

[kelson42]

I believe the submit button should be deactivated after the first click... and if not clear that the page is loading, increase this user feedback.