Authorization code and email validation

[ReneRanzinger]

• Make this a separate page
• The email should also include a link to this page
• Remove the "<#>GSA:" from the email text
• On the page add a note about checking the spam folder (thats what happend to me)
• 10 minutes is not much time. I would give a day (or at least an hour)
• If I am providing an invalid code, I end up on an empty page with no way back.
• If the code is expired I get an error message (exception-error-S4EP84) and end up with an empty page. I also have no way of requesting a new code.