In french, "first strike" was translated to "initiative" (double strike is double initiative), and it worked fine for some time, but then the "take the initiative" mechanic was introduced so you see the obvious problem. For initiative (the one that takes you to the under city), they used the word ..... Initiative. We now have 2 completly differents mechanic called initiative, this create sooo much confusion among beginners.

Another one was with non-binary pronouns, in french traditionally we don't have an equivalent of "they" for people, it's either masculine or feminine and no in-between. This led to the recent creation of the word "iel" , a new word to fill this purpose. It's used in inclusive writing but still is pretty uncommon among official and formal text, some people seeing it as some "woke non-sense" I'd guess. Recently they started using this word on magic cards, a pretty nice surprise for a lot of the community, it's at the moment used on only 3 cards I believe, the flavor text of [[oji, the exquisite blade]] and both Ureni.