Can you explain yourself a bit more please. If you are talking about a plugin which translates words you type in a conversation, then the only plugin i know of, is
Stuffplug EDIT: (this is not Stuffplug NG)
It has many features which can be found in the attached text file.
One feature is the translate tool, but it uses google translate.
The command is
/xtranslate <langpair> <text>
The <langpair> can be the following.
Hope this is what you were looking for.