-Finish rules translation in Spanish + improve existing ones
-Design: final touch (gain extra space on top, using space on the right)
-Crazyhouse: center reserves, grey if zero available, numbers superimposed
-Promotions: increase pieces sizes, better background.
-Code: use two spaces instead of tabs, everywhere.
-Increase code line length to 100 or more?
-(http://katafrakt.me/2017/09/16/80-characters-line-length-limit/)
+Translations (including About page), refresh rules