I'm having some problems with the default message.properties and how to override them.
I've managed to override a few of the messages...
org.jboss.seam.loginSuccessful = Aren't you cool #{identity.username}? org.jboss.seam.loginFailed = Invalid username/password combination. org.jboss.seam.notLoggedIn = You need to login
Please file a JIRA issue - I'm not sure whats going on here, and Shane is away for Christmast now.