- https://meta.wikimedia.org/wiki/Requests_for_new_languages/Wikidata_Talossan
- https://www.wikidata.org/wiki/Wikidata:Contact_the_development_team/Archive/2015/05#Finland_Swedish_.28Q1461092.29
We need to first understand what sensible requirements for new terms languages are. The language committee had at least two statements on that:
- https://blog.wikimedia.org/2013/11/06/any-language-allowed-in-wikidata/
- https://meta.wikimedia.org/wiki/Requests_for_new_languages/Wikidata_Cape_Verdean_Creole#Discussion
Currently, they are added in ExtraLanguageNames:
https://phabricator.wikimedia.org/diffusion/OMWC/browse/master/wmf-config/InitialiseSettings.php$15823
That also adds them for monolingual text values.