translator.py is a plugin for the X-Chat IRC client  that allows the user to have the chat from users translated.

Download the file,  and in Xchat load it by clicking on xchat, Load plugin or script.  To have it load automatically , download it to the .xchat (hidden) folder in your home directory.

There isn't any documentation for the plugin on the Google code site, so I had to look at the script to figure out how to use it.

To translate a user's chat, type /a2tr username,  and subsequent posts from that user will be translated into English.  

The script can be modified to translate to languages other than English.  Using a text editor, open the translator.py file.  On line 136, change 'en' to one of the other language codes found on lines 32 to 122.  Likewise change line 229.   Restart Xchat. 

Enjoy.

Sadly, this plugin no longer works due to Google's decision to make the translate back end a pay to play product.