Details on how to upgrade an existing language configuration from the old file format to the new file format can be found in the article Language Configuration - Upgrading.
Language Configuration
Lionbridge and inRiver uses different language codes for each of their languages, and therefor a language configuration file needs to be set up.
The language configuration is part of an xml file that will be used as a setting for the Outbound Connector, if you're running inRiver 6.3, or the Extensions if you are using inRiver PMC.
Example:
I want to translate English (Great Britain) into Swedish and Norwegian.
Considering that scenario, here is a possible language configuration file