[wp-hackers] Change Login Error Message

[Ryan Bilesky]

I have a MS install, in wp-includes/users.php line 94, if the user account
has been marked as a spammer, an error message is displayed saying the
account has been marked as a spammer. However I would like to change the
message to something more generic like your account has been banned.  Given
that this is handled by the WP Errors class I'm not sure how to change it
via a plugin.  Any help is much appreciated.