Hello everyone, and sorry for necroposting.
I just met the same problem when I tried to add a new page for Altitude in Russian to the Wiki (
http://wiki.flightgear.org/index.php?ti ... ction=edit).
I am pretty sure that MediaWiki somehow does not treat Cyrillic characters in the article name well, as I was able to successfully translate Cessna 172P without any issues.
A couple of days ago I've sent an email as suggested at Help:Contents - however, I got no response so far. Is there anyone else on the forum who could help solve the issue?
UPD: Got in contact with Simon, looking into this.