its seems i will reveal this... in battlefield 1 theres a map called fort de vaux and theres a door with the words isolement above it and you have to go round the map to find buttons that spell isolement so 9 buttons and once you find said buttons the door will open n if you complete the puzzle in the room you'll get a special dog tag for completing both puzzles and why did the code translate into french well because fort de vaux is a french map