Registration Error Text Change

Hi,

A quick question: I have the membership and terms of service plug-ins. I figured out how to change the "Terms of Use" text on the registration page to read "Licensing Agreement" instead; however, I cannot figure out where I can change the error message text. It still reads "You need to agree to the terms of service to register." if someone hasn't checked the box. Any help on where I can find that code to fix it?

Thanks!