Hello, and welcome to my user page! I've been a moderator on the English wiki for over 2 years (maybe almost 3 years now), and also moderate the wiki in all other languages.
I speak primarily English, and studied French in high school and college. I'm not at all fluent! But I do have access to the game's data files, so I try to concentrate on copy/pasting the information directly from the game.
If I've made an awful translation, please feel free to fix it, and/or message me about it! If you find a bad translation that exists in the game (and the underlying data files), the proper thing to do is leave it as is on the wiki, and make a note about how the translation is flawed. After all, the wiki needs to reflect the game, including its errors.
The most important thing is to stick to in-game terms, and secondly, to have fun!
Enjoy your time at the wiki!