docs: add Japanese translator credit and fix Opus bitrate

- Add Re*Index.(ot_inc) as Japanese translator in About page

- Fix CHANGELOG: Opus is 128kbps not 256kbps

CHANGELOG.md

@@ -6,9 +6,10 @@
 
 - **Lossy Format Support**: Download in MP3 or Opus format with configurable quality
   - New "Enable Lossy Option" toggle in Settings > Download > Audio Quality
-  - Choose between MP3 (320kbps) or Opus (256kbps) format
+  - Choose between MP3 (320kbps) or Opus (128kbps) format
   - Downloads FLAC first, then converts using FFmpeg
 - **New Languages**: Turkish and Japanese translations
+- **Japanese Translator**: Re*Index.(ot_inc)
 
 ### Changed
 

lib/screens/settings/about_page.dart

@@ -472,6 +472,12 @@ class _TranslatorsSection extends StatelessWidget {
       language: 'German',
       flag: '🇩🇪',
     ),
+    _Translator(
+      name: 'Re*Index.(ot_inc)',
+      crowdinUsername: 'ot_inc',
+      language: 'Japanese',
+      flag: '🇯🇵',
+    ),
   ];
 
   @override