If you are a subscriber, translate allows you to translate your language into a different language on the chat. Set your "Chat Language" to "Auto-Detect Language", set "Your Language" to whatever language you speak and then set "Speak In" to whatever language you want it to be translated in. It can be used for all sorts of things, such as allowing people to translate to English in an English-only chat.
To use the app, you have to click the "translate" tab next to the chat and make sure to be registered and have at least a day to use it.
Source: https://util.xat.com/wiki/index.php?title=Applications#Translate