I couldn't find the behavior, that redirects to the checkout_success page.
But anyway, I would run into a problem. The different languages are handled with include files. If I change the server behavior, I change it the same for all languages. So I can't send customers to their respective checkout_success page.
That means I would have to go with three email behaviors, that are triggered on page load and by the session language. How do I have to set the trigger to accomplish that?
Or do you have another idea?