Comment 2 for bug 1192043

Needs to feed back detected language to translator.

Needs to be easy to find the actual .xq/.jq file on URI path, so the hashing approach may not be desirable.

Possibly an index would be a good idea, either on-disk or in-memory. Would probably need to be optional to make it easier for people to install their own modules.

Maybe just having a bunch of disk stat()s isn't that big a deal, although we do need to ensure that all possible on-disk locations are exhausted before any network attempts are made.