-End of game a bit too verbose: should just say "Black win" ... + show PGN
-Styles must be improved (full width for smartphones, selectable text for PGN...)
+global lang cookie, + display (remember in each variant what is shown...)
+translations (how ? switch on index page only, then find ideas...)
+for each variant, adapt FEN (Crazyhouse, Grand, Loser, ...)
+Improve style for various screen sizes