Re-add bit of code that was lost in merge commit?

We think this was lost in
https://github.com/dimagi/commcare-hq/commit/71b96457d8c826deec219b5258e2ed2c7346974d
but aren't super sure what happened.
Refactored product error message to use red box

Previously all messages showed up in happy green area, now users can
easily see they were bad and messed things up.