The latest version has the theme line commented out, as this isn't needed. But the languages are actually used. In the cron directory there should be a languages directory that has the necessary language files for the subscription routine. I use these here for my cron tasks. You should be able to run them from the command line if the variables are setup ok. Actually this is the best way to test to see if they are working as you won't have to wait for the cron job to execute.
