This is definitely a problematic solution to the problem, because the current implementation just adds in a list of 10 languages or so, and goes from that. But this is MediaWiki! I18n is important!

I've added a patch that takes all possible language codes and names, checks if there is an existing template for each language code, and only includes the ones with proper templates. This should allow much better support for multiple languages, and definitely for Nordfriisk, because Commons has a template for it.

However, there is a problem: Commons has many, many templates. It's likely that we'll need to come up with a better solution than "drop-down list, go!" for the language selector. I wouldn't expect this patch to get deployed to Commons anytime soon.

The patch is at https://gerrit.wikimedia.org/r/9528, but again, it's a temporary solution and should probably not be used on a wiki with a lot of language support, due to usability problems.

This is probably fixed in master, so one of two things should happen:

1. Confirm that it's fixed after testing and comment here

2. Confirm that it's not fixed after testing and reopen with a comment and further information

If you see that it's still broken on Commons, that's not enough to reopen this bug. You need to also confirm that Commons is running the latest master, or alternatively test on your own local machine with the latest master.

Thanks for the report, and hopefully this will help things move along!