This article applies to Nelio A/B testing versions prior to 5.0.
If you are looking for documentation for our newest version, please bookmark neliosoftware.com/testing/help/
YES it is! qTranslate is a multilingual WordPress plugin that stores all languages alternatives for each post in the same post. Therefore you can split test your qTranslate-based multilingual site similarly as you'd do when testing any normal page/post. Read more here.
By the way, Nelio would also work for the different existing forks for qTranslate, like mqTranslate.