[ Added] New good looking summary message at the end of the game

[ Added] Added game sign block states (colored stained glass behind the game signs) (see config.yml for more)
[ Added] /bb command is now translatable via language.yml
[ Changed] Admin commands (/bba) are now better with hover and click event (JSON messages)
[ Changed] Default map name when creating new arena is arena ID not "0" now
[ Fixed] Now warning message "can't save language.yml because already exists!" won't occur anymore
[ Fixed] Fixed error in console when player left the arena and his plot was cleared even if he didn't have it (reported by @BlueObsidian)
[ Fixed] Now you can't change your floor by NPC during the voting time