I hate that the entire Excel language is translated to Norwegian. But the worst thing I’ve encountered was a Norwegian error from a Microsoft server software many years ago. I think it was IIS. “Målet kunne ikke aktiveres på grunn av en hendelse” or some shit like that. (It was hopeless to google since so few people would have ever seen it. Also the words didn’t make sense at all and seemed to have been translated using a bad translation service.)