Translate wp-login.php errors

Just trying to figure out how to get translated error messages for the wp-login.php file. Can’t seem to figure it out. I’m currently using the WPML plugin to translate the site’s posts and pages. It also does a pretty good job of translating strings used in the theme. What I can’t figure out is how to translate the login page and the errors it throws. I know the WP_Error class has options to display the errors, just trying to understand how the errors are being sent.

Any help is geatly appreciated.

Peter