Hoi!
I don't know anything about Linux locale, but this wiki is just one of thousands resources in this orthography.
None of them is an ISO code.
It is not recognized by ISO
Exactly, It's just as you say. Why it's not recognized is none of our problems. We don't aim to become a power centre capable to deliver international recognition. Your problem must be dealt with at ISO level.
Bèrto d Sèra Personagi dlann 2006 për larvista american-a Time (tanme tuti vojàotri) http://www.time.com/time/magazine/article/0,9171,1569514,00.html