Issue: embedded rules language not updated when language is set (in Analyse, Game and Problems)
Also: if new live game starts in background, "new game" notify OK but not first move (not too serious however)
+On smartphone for Teleport, Chakart, Weiqi and some others: wait re-click to confirm "touch" move (in Board.vue)
https://www.chessvariants.com/crossover.dir/koopachess.html
--> Can a stunned piece capture? Maybe not. ...recover? After 5 moves? Never?