feat(flutter): 播放页长按手势与加速态

lib/l10n/app_localizations_id.dart

@@ -154,6 +154,11 @@ class AppLocalizationsId extends AppLocalizations {
   @override
   String get playbackSpeed => 'Kecepatan putar';
 
+  @override
+  String speedBoosting(String speed) {
+    return '${speed}x kecepatan';
+  }
+
   @override
   String minutesAgo(int count) {
     return '$count mnt lalu';