I agree with @IslandWind. about writing it in your first language, then translate to other languages from the original text.
Though I haven't tried it yet, I think you might be able to use AI to translate more accurately by not just getting the AI to directly translate sentences, but tell the AI the overall story and context before trying to get anything translated.
Also; in the "Help wanted" section, you can make a "LFS" post (Looking For Someone) and ask if anyone wants to help with translation or proof reading. Most people post about music and art, but I've seen a few people offering translation help.
Best of luck with your project :)