Reading the Gentoo Development Guide doesn't offer much help on LINGUAS:

   http://devmanual.gentoo.org/general-concepts/linguas/index.html

It says to look at games-rpg/nwn, but that ones seems to use LANGUAGES 
instead of LINGUAS.  My ebuild is EAPI=2 and the application in question 
supports English and German.  What is correct, LINGUAS="en de" or 
LANGUAGES="en de"?