I'm not sure that I'm understanding the problem but while looking at it, I did note that the Plasma/FAQ/4.4 (which is what the user is actually reading) didn't have Special:myLanguage at all, so I've fixed that.
Plasma/FAQ itself only contains the redirect to the latest version, and the redirect has to be changed when a new version is made. Apart from that, all the links have /4.x in them. I would have thought that between that and the myLanguage thing it would work. If it doesn't, can you explain a bit more about what actually happens? Thanks