Yes, I see that unit T8 was in the source all the time. It seems, however, that beeing placed between </ translate> and < translate> tags, it was "disabled". Following the various edits it must have somehow ended up beeing activated, causing ancient content to be inserted in the translated pages.
If this is correct then we should probably remove the T8 unit tag so that this kind of problem will not hit us again.
Lessons are learned :-) If I ever need to do anything like that again I will remove the leading tag as well as the internal ones, and let the system re-tag it.
BTW, I'm still seeing people add tags manually. There is a strange reluctance to read the guidelines, where we have prominent reminders that this breaks the system.