I'm trying to use the translate API Docs: http://googlecloudplatform.github.io/google-cloud-java/0.10.0/apidocs/?com/google/cloud/translate/package-summary.html

I can't find anywhere that lists the set of valid language options. Should this be an enum somewhere?