I and a friend belong to speakers of the Toki Pona language and have noted that we recently cannot state our proficiency in that language on our user page, along with our other languages in the Babel box, because support for Toki Pona in the Babel extension has been removed in f846383260f1.
I cannot find any justification for that removal linked to that commit. Toki Pona Wikipedia may long have been closed down, but listing languages that a user speaks should IMHO not be strictly limited to languages that we have Wikimedia projects in. AFAIK, the original purpose of the Babel templates was to let other users know which languages other people speak, in order to enable communication among users. The use of Babel for automatic filtering of language content on Wikimedia sites, such as Wikidata, came only second to this.
Currently, there are for instance 50 users on English Wikipedia who indicate Toki Pona on their user page, or 30 such users on Esperanto Wikipedia. Some projects have long created custom templates, but as a polyglot with edits on 80+ Wikimedia projects in 60+ languages, I do not want to need to import and maintain a set of templates in each and every project I contribute to, just to be able to set up a user page (I often do not have a good command of the project's native language, so listing my other languages comes especially handy). Therefore, I ask that the support of Toki Pona in Babel be restored.