Template:Disabled language
Klingon probably won't be enabled, and this was discussed many times.
Sakizaya will probably be enabled. It's a technical matter now. The best place for discussing it is https://phabricator.wikimedia.org/T174601
As for Chibcha, it's the first time I'm hearing about it, but it is unlikely to be enabled given what the Wikipedia article about it says (extinct circa 1800). I'm flexible about sincere and serious language revitalization projects. I'm not quite sure why was it ever added to translatewiki.
The Sakizaya case is the most confusing here, of course. The template on the portal looks very fatal, and it's not quite the case. It should be rephrased for clarity, probably with something like a "status" or "reason" parameter.
Also, its translations should really be moved to a proper localization system, like translatewiki.net or something ;)
"Its translation should be moved to ... translatewiki.net".... We are on translatewiki.net !
Translatewiki.net is not required to support only Wikimedia projects, it can support Wikia, where Klingon is accepted (but it uses a script that is not encoded in Unicode, only encoded in ISO 15924. The proposal to encode the Klingon script was made by Michael Everson at Unicode, and as it was rejected, Klingon is for now encoded in PUA space using the "ConScript PUA registry"... managed by Michael Everson which supports more languages than what ISO/IEC WG2 or the UTC want to support.
It was rejected simply on the fact that most Klingon users wrote it in the Latin script (but with several variants or transliterations, not always the one promoted by KLI, notably some users prefer using extended latin which more accurately represent the sounds, like c with hacek, small capital i, or l barred with curl, and then allow the script to be romanized with common dual casing, which makes it more readable).
There's nothing wrong in translating MediaWiki in Klingon even if there's no Wikimedia project for it. But Wikimedia wiki do not want to support languages written in scripts requiring the use of PUAs (nomally intended to be for private use, and then limited in scope to specific projects using it in their own community).
Also I'm not adding any new language, I'm just sorting what is existing on this wiki, and then display a correct status.