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Page redirection does not work with the translation system! See for example the first two links in Plasma#Further information: Plasma/FAQ redirects to Plasma/FAQ/4.4. However, for the Special:myLanguage 'trick' to work we would need a Plasma/FAQ/da redirect to Plasma/FAQ/4.4/da and so on for each translation. (I assume this would work.)
This kind of solution does not seem to be maintainable. I don't see any solution to this problem that is both maintainable and elegant, so I propose a simple, maintainable but not very elegant solution:
Create an actual Plasma/FAQ page containing only links to the various versions of the FAQ. That way, when a new version of the FAQ is created, we just add a link to it here. Of course this link page should be translated. (Perhaps it would be easier to create a new Plasma/FAQ/Index page and change all links to Plasma/FAQ to this page?)