CLC-2236 - IMPLEMENT: when a user can't create an account because of new limits
https://jira.media.berkeley.edu/jira/browse/CLC-2236

Since the 404 and the "Sorry" page are so similar, I used the "Status page" CSS for both of them.
Makes everything more DRY and that's how we like it.
Merge pull request #1335 from christianv/CLC-2236

CLC-2236 - IMPLEMENT: when a user can't create an account because of new limits