Effectively, tried to copy/paste a few mods outside my main folder that have "é" and it worked.

Ok so i definitely found the problem, but yep it is since the update, with Play With Six, my "mods" folder was on a different hard drive disk and were working fine, i tried to move the folder on the same HDD than Arma 3 it was the same, and now i tried with a few mods by creating a "mods" folder inside Arma 3 folder and they are all working fine.

After testing all of the day, effectively it seems to not be the launcher but i don't know why, every workshop mod works fine by the A3 Launcher, but if i use any mod that isn't from workshop, even with the A3 Launcher, they don't work anymore. I'm still trying to find the issue but i still haven't manage to find it.