Missing checkbox for accept the terms - important in germany !

You have the Terms Of Service - Plugin, but i don't testet with the contact widget.
It is very important in germany, so we mus paid 300 USD for the law men.

Here a contact website with terms and the checkbox. So this checkbox is a required field. Without this can't send the message (in germany/austria/switzerland)

Please, help me for an solution. Thanks

Best regards
Andy