There are multiple different solutions for multilanguage.. Here’s a few:
http://modxcms.com/forums/index.php/topic,1788.0.html
http://modxcms.com/forums/index.php/topic,6024.0.html
http://modxcms.com/forums/index.php/topic,10919.0.html
http://modxcms.com/forums/index.php/topic,1957.0.html
http://modxcms.com/forums/index.php/topic,10807.0.html
I would probably try the last one. MODx 1.0 will adress the i18N/l10n at core level (including versioning and rollbacks). Read more about that for example from these threads:
http://modxcms.com/forums/index.php/topic,10808.msg73291.html#msg73291
http://modxcms.com/forums/index.php/topic,5664.msg40124.html#msg40124