Registration Alert Errors

Hi,

I’ve hacked the WP AJax-Login Plugin to work with WP User Moderation plugin so that the Ajax-Login Plugin inserts “true” into the “pending_activation” field that I’ve added into wp_users.

Everything else is okay, their information is entered, they’re marked as pending, I get an email letting me know to activate them but…

…now, I need to figure out where to change the error that’s produced when a user registers.
They currently get an alert that says “Unknown Registration Response”. How can I change that error to read “Registration pending approval”.

Thanks for any help!