I can’t believe nobody has done this list yet. I mean, there is one about names, one about time and many others on other topics, but not one about languages yet (except one honorable mention that comes close). So, here’s my attempt to list all the misconceptions and prejudices I’ve come across in the course of my long and illustrious career in software localisation and language technology. Enjoy – and send me your own ones!
I believe French does this as well. To answer in the affirmative to a negative question, you use “si” instead of “oui”
“Si” is also the word for “if”, which has probably confused people.
(top search hit, not sure if good, but on a quick glance it looks correct https://www.commeunefrancaise.com/blog/si-in-french )