GNOME Chess 3.10.3 Fixes Various Annoying Bugs

GNOME Chess 3.10.3 will no longer overwrite saved games, no longer displays false error messages about the chess engine, fixes some critical warnings when starting a new game, fixes issues with the colors of pieces in figurine algebraic notation. Furthermore, this stable release ensures that the chess engine is always killed, even if the application crashes, repairs minor file descriptor leaks, updates the screenshot link in appdata, fixes the image in first_move_button, and updates the Simplified Chinese translation.