Sorry for the delay, been busy working on some PR's
I'm actually not sure about this, the autoloader in 1.1 is a bit strange since the file naming and directory structure were not PSR (2.0 is).
You should be able to place the files in a directory and add them to the loader as
$autoloader = Elk_Autoloader::instance();
$autoloder->register(YOURDIR, '\\YOURNAMESPACE');
but I'm just not sure with language files since I've never tried this.