Nintex Forms 2010 is translated into 9 languages, and here you can find translated installation guides for those languages.
For the latest information, please see Installing Nintex Workflow 2010 and Nintex Forms 2010 (English version).
I couldn't seem to find anything in the support blogs, but is there a way to have multilingual support for Nintex Forms 2010?
Ideally I would like to design 1 form that can be viewed in multiple languages depending on the users locale settings. Is this even possible?