I use discourse meta in German. But the message about the advanced tutorial I received yesterday was in English. I don’t know why, I think it is not a missing German translation.
What I think is confusing is that if I do what the message says, the tutorial will not start, because discobot would just react to the German wording. Although he just told me the English one. I think this behaviour is strange. I expected the tutorial to start.
This is quite odd, as this particular string (the first one coming from Discobot in the screenshot) appears to have been translated more than 6 months ago: