TODO

   1 Finish rules translation in Spanish + improve existing ones
   2 Design: final touch (gain extra space on top, using space on the right)
   3 Crazyhouse: center reserves, grey if zero available, numbers superimposed
   4 Promotions: increase pieces sizes, better background.
   5 Code: use two spaces instead of tabs, everywhere.
   6 Increase code line length to 100 or more?
   7 (http://katafrakt.me/2017/09/16/80-characters-line-length-limit/)
   8 Chat button should be more apparent after game ends (color ?)
   9 Reinforce security for problems upload (how ?)
  10
  11 The mode switch between human/computer/friend (+ problem) is a mess
  12 (example: finished computer game, ongoing friend game, reload, friend game is unreachable)
  13
  14 Later:
  15 Let choice of time control, allow correspondance play, several games at the same time
  16 ==> need to use indexedDB instead of localStorage. Maybe with Dexie https://dexie.org/
  17 Each user would have a unique identifier stored in the client DB.
  18 Allow to cancel games (if opponent doesn't connect again)
  19 Identity would be browser-based: different games on smartphone, home computer, work computer... (why not ?)
  20 Index might still look the same, and variant page would have another tab "Games"
  21 ==> running, and finished (which can be deleted from local memory)
  22 (A true analysis mode could be implemented also, to navigate in completed games --> use a button)
  23 Allow challenging a specific player (by his chosen name)
  24 But keep the random pairings as main playing way + always playing in ZEN mode,
  25 except when accepting an individual challenge.
  26
  27 style menu : surligner onglet courant
  28
  29 Interface :
  30  - newGame: une modalBox à paramètres, timeControl, type d'adversaire ==> "new Game")
  31  - friend-->renommé en 'analyse' et devenant un vrai mode analyse (on garde ces trois modes ?)
  32
  33 problèmes : récupérer 20 ou 50 depuis le serveur, puis les afficher un par un en les analysant directement,
  34 comme sur le site de ProgramFOX ==> présentation unifiée échiquier avec instructions dessus et soluce cachée dessous
  35
  36 ==> il faut pouvoir faire "new Interface(variables)" pour lancer une analyse de problème sans repasser par le mode jeu...
  37
  38 Importer des parties : nécessite de parser le PGN produit (possible, un peu pénible)
  39 mais permettrait mode analyse (avec bouton "analyse", comme sur ancien site).
  40
  41 espagnol : jugada ou movimiento ?
  42 fin de la partida au lieu de final de partida ?