We currently have less than 600 languages available on Lingua Libre, and only administrators can add new languages, using LinguaImporter, which just asks for the Wikidata Qid of the language and adds it automatically. There are [[ https://w.wiki/3TWE | more than 10.000 languages ]] described on Wikidata.
I wonder why we don't just import all languages from wikidata, since it can be done automatically. This would allow users to record words on Lingua Libre in their language without having to ask to an admin to add it. It is possible that some users wanted to record in their language and abandoned when they saw that is was not available.
We could synchronize the databases periodically, to have on Lingua Libre labels that were added on Wikidata since the last synchronisation and vice-versa (if labels were added on Lingua Libre and not on Wikidata)