Error messages from signup_validate_anon_email() not translatable

I just noticed that the error messages generated by signup_validate_anon_email() aren't translatable. CVS blame points to some of the new remaining lines of code from the previous maintainer. ;)

1.65         (thehunmo 18-Jun-06):     $message = 'Invalid email address entered for signup.';
...
1.65         (thehunmo 18-Jun-06):     $message = 'The email address entered belongs to a registered user.';
...
1.65         (thehunmo 18-Jun-06):     $message = 'The email address entered has already been used to sign up for this event.';

It's a trivial fix. Just wanted an issue about it to reference in the CHANGELOG and commit message...