Added language variables for invalid moves
+ bugfix in Board::range() (used for rook, bishop and queen validation)
+ fixed typos in README
Replaced all tabs with spaces
Added missing documentation
+ Removed obsolete ClassNotFoundException
Completed Pawn validation
+ added full capturing support
Fixed visual 'capturing' glitch in view
+ fixed inconsistent font use for prison in view
Fixed/Completed capturing (en passant)
Added capturing to move messages
+ bigger chess icons in chat messages
+ added status info 'your turn'
Added promotion