The client is available in English, French, Japanese, Spanish, German and Korean and it's also compatible with the Chinese versions of the QQ. According to the information found on the developer's website, the instant translation feature is not available as default because you have the possibility of translating your language into other 50 languages. You can check for this info on the About page. Use the link below to access it.
About page: http://blog.imqq.com/sample-page/t