Update of illustrations and the game menu

1. [p]Added logic for switching the video in the main menu depending on the current act. For now, Autumn and Winter are available.[/p]
2. [p]Updated:[/p]

[p]2.1 Images for 70 quests[/p][p]2.2 The game’s technical foundation (preparing the Korean language release; significant additional work was required due to the “non-standard” alphabet)[/p]