Custom Message Add-on Translating

Hello!

I am using your Custom Message Add-on to display a login/sign up form to my users.
Example here: http://en.lililove.me/demo/eggs_theory/

But as you can see on that example displayed message isn’t translated.
You could change language http://en.lililove.me/demo/eggs_theory/ — http://lililove.me/demo/eggs_theory/ and you’ll see that everything is translating but not the custom message.

For language changing I use WPML. I tried to implement strings in custom messages using php code:

<?php
_e('custom message','wpml_theme');
?>

But it isn’t working I think because of privacy reasons.
Could you propose smth to translate these messages?

Using default messages for me isn’t a good variant 🙁