-Allow to navigate in game after it's over (back/play)
-For animation, moves should contains "moving" and "fading" maybe...
-(But it's really just for Magnetic chess)
-setInterval "CRON" task in sockets.js to check connected clients
-(every 1hour maybe, or more)
-Button to show all pieces that can move (next to expert mode; change icons)
-Some bots are very weak, others quite slow...
+MarseilleChess: revise bot and test
+Translations (including About page), refresh rules