@Tacsipacsi : Thank you, that's interesting to know - it would have taken me for ever to ascertain that with any certainty from the doumentation. But what about the /en versions of pages that appear - do they serve any useful purpose?

@Base: Well you could, but you need an excellent understanding of how the Translation Unit tags work and the ability to insert them without error. But I assume you might also have to manually hack the database to mark the page as available for translation - definitely not a good idea.

I believe characterising this as a feature request with one single use case does not do it justice. Page Previews are completely broken when the Translate extension is installed. For example, hover over any link in mediawiki.org/wiki and you get a useless Spcial:MyLanguage pop-up. Compare this with Wikipedia where you generally get a highly informative page preview.