[nisse72]

When I studied computer science in Uppsala ~ 25 years ago I remember a number of textbooks (in particular, from Pagina) that used Swedish words for absolutely everything ("betjänt" (server) comes to mind, I can't think of others at the moment). but a lot of those terms sounded odd to us and I don't remember anyone using them except perhaps to be funny.

But many words have more natural sounding translations that we did (and do) use, things like kompilator (compiler), kö (queue), träd (tree) etc. I left Sweden many years ago but still often use gurka as a metasyntactic variable.

BTW your "even funnier idiom" is well known in english as well (although I don't remember the last time I heard anyone say it):

https://en.wiktionary.org/wiki/cat_that_ate_the_canary