Although I haven't seen mention of it specifically used with Vantage, there are some customers who have tried the WPML plugin with ClassiPress and JobRoller with some amount of success, although not 100% (i.e. some fields remain untranslated). One such related thread
here has a link to show it in action on the customers JobRoller site, but as he and others have stated, there are a few things that don't necessarily work correctly. AppThemes does not officially support third party plugins, so essentially if you were to try these, it would be up to you to make the necessary changes to make this work. We have had past discussions with the creators of the plugin who also carried out some testing on their end for compatibility, however this has never been fully resolved to the point where we can guarantee it will work. Thanks.