-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
+Finish rules translation in Spanish
+Design: final touch (gain extra space on top, using space on the right)
+Crazyhouse: center reserves, grey if zero available, numbers superimposed