Steps to replicate the issue (include links if applicable):
Go to function editor fall back view.
Try and add a new language for an argument.
What happens?:
You are unable to get language options to show.
What should have happened instead?:
Languages should be selectable.
Software version (skip for WMF-hosted wikis like Wikipedia):
Other information (browser name/version, screenshots, etc.):
I believe this change broke it: https://gerrit.wikimedia.org/r/c/mediawiki/extensions/WikiLambda/+/824453
