Recently I've been browsing the French subforum of BitcoinTalk
I hope you didn't visit the 'Hors Sujet' section.
I have tried to post in the past, usually erasing my response due to anxiety of getting sentences wrong - honestly curious if anyone in those subforums would care or mind?
As long as you don't write "Tabernacle" or "Ostie de caribou", it should be fine (and be careful, the word "gosse" doesn't have the same meaning in France and in Quebec

).
I'm pretty strict when someone posts for a paid work (translation) (I'm sick of the mining swimming-pools), but if it's at least understandable, there will be no big problem.