Changelog:
* added localization support (gettext)
* translations: Catalan, Dutch, French, German, Japanese,
Luxembourgish, Russian, Simplified Chinese, Spanish
* added 1 new arena (Ruins)
* added "numeric keypad" to control options
* changed menu font, added text shadows
* replaced instructions with demo game
* changed some animations
* new title music, new samples
* fixed some minor bugs
* cleaned up data directory
* dropped low graphics mode