SpigotMC/Spigot — pull request #113 by Smove (2014-01-31 22:00:59+00:00)
Title: Allow to get player language on multilanguage server

Every day more servers grows up and get international. Some of these like to have more than one language. To get the language the user like to have, you can use player.getLanguage() that returns the original minecraft language strings like "en_US"