I noticed, that we now have breadcrumbs - great news! Unfortunately, they don't work well with translated pages. The page A/B/C will have a breadcrumb something like this [[A|A]] < [[A/B|B]] < C. The Danish version af the page is A/B/C/da, which will generate this breadcrumb: [[A|A]] < [[A/B|B]] < [[A/B/C|C]] < da which has two problems. First, the trailing da should not be there, nor the link to A/B/C (admittedly this is a minor complaint), and secondly, the links to A and A/B go to the English pages, where they should go to the translated pages A/da and A/B/da.
I can't see how this is implemented, but if it uses ordinary wiki syntax, I guess adding Special:myLanguage to all links would solve the second problem.
The breadcrumbs are actually built in to Mediawiki, and automatically generated. I will mention it to the Translate developers, to see whether they have any ideas, but there's nothing we can do in terms of mediawiki syntax.
I'm told that changes need to be made at code level. We have a "volunteer" that says he will try for it when he gets home in a few days. (For "volunteer" read "press-ganged volunteer" :-D )