>>! In T151269#2822033, @Nikki wrote:
> I had a look at that tracker and found http://unicode.org/cldr/trac/ticket/9137 where two of the codes here (fkv and sje) were already requested but rejected. Given the following comment, it seems like it would be a waste of time to request the addition of more languages there:
>> We agreed to document there is no intent for CLDR to have the English names of all languages (there are over 7,000) of them, and point to http://www.iana.org/assignments/language-subtag-registry/language-subtag-registry as a source for any extra ones that people need.
(Not only those MediaWiki supported) See parent tasks for use cases. They should preferably be translatable, but there should be a way to prevent duplicates in translation.
http://www.iana.org/assignments/language-subtag-registry/language-subtag-registry is a good resource.
Also we may adapt an existing MediaWiki extension, like CLDR.