Update to audio quality setting clarity (Translators note i18n README.md)

- Changed audio quality setting to match MusicKit audio options (Low -> Standard)
- Added descriptions for audio quality options
- Audio quality now uses string for setting instead of direct bitrate option.

src/main/base/store.ts

@@ -28,7 +28,7 @@ export class Store {
             "volume": 1,
             "lastVolume": 1,
             "muted": false,
-            "quality": "256",
+            "quality": "HIGH",
             "seamless_audio": true,
             "normalization": false,
             "ciderPPE": false,