Allow a settable message on Aha private idea portals

When a customer without an account gets to the privatge portal, there is a register button that allows self-registration for partners and employees with the right email domain. Customers will not be a member of these domains.  When they click on the register button, it just sends them back to the login page with no explanation that they need to get an account by other means.  Because there is no message on where they need to go or what they need to do, the looping behavior appears to be a software flaw, a situation which we get many complaints. Suggest adding a settable custom message on the login page to eliminate the confusion.