Audio optimization, usability fixes, sound peak blowout fix, Polish translation, bugfixes

- Reduced latency in audio
- Fixed sound effects volume
- Fixed broken buttons in audio settings clipping the maximum volume to 5, despite the fact that the default value was 8. Now it should limit it to 8.
- Polish language translation
- Fixed wrong maximum BGM volume limit in sceAttract.
- Changed default volume from 4 to 5. Because 4 is too quiet.