feat(l10n): Add silence duration settings for speech-to-text

lib/l10n/app_localizations.dart

@@ -1844,6 +1844,18 @@ abstract class AppLocalizations {
   /// **'Connect to a server with transcription enabled to use this option.'**
   String get sttServerUnavailableWarning;
 
+  /// Label for the silence duration setting in server speech-to-text.
+  ///
+  /// In en, this message translates to:
+  /// **'Silence Duration'**
+  String get sttSilenceDuration;
+
+  /// Description for the silence duration slider in server speech-to-text settings.
+  ///
+  /// In en, this message translates to:
+  /// **'Time to wait after silence before auto-stopping recording'**
+  String get sttSilenceDurationDescription;
+
   /// Label for selecting the text-to-speech engine.
   ///
   /// In en, this message translates to:

lib/l10n/app_localizations_de.dart

@@ -966,6 +966,13 @@ class AppLocalizationsDe extends AppLocalizations {
   String get sttServerUnavailableWarning =>
       'Verbinde dich mit einem Server mit aktivierter Transkription, um diese Option zu nutzen.';
 
+  @override
+  String get sttSilenceDuration => 'Stille-Dauer';
+
+  @override
+  String get sttSilenceDurationDescription =>
+      'Zeit nach Stille warten, bevor die Aufnahme automatisch gestoppt wird';
+
   @override
   String get ttsEngineLabel => 'Engine';
 

lib/l10n/app_localizations_en.dart

@@ -960,6 +960,13 @@ class AppLocalizationsEn extends AppLocalizations {
   String get sttServerUnavailableWarning =>
       'Connect to a server with transcription enabled to use this option.';
 
+  @override
+  String get sttSilenceDuration => 'Silence Duration';
+
+  @override
+  String get sttSilenceDurationDescription =>
+      'Time to wait after silence before auto-stopping recording';
+
   @override
   String get ttsEngineLabel => 'Engine';
 

lib/l10n/app_localizations_fr.dart

@@ -975,6 +975,13 @@ class AppLocalizationsFr extends AppLocalizations {
   String get sttServerUnavailableWarning =>
       'Connectez-vous à un serveur avec la transcription activée pour utiliser cette option.';
 
+  @override
+  String get sttSilenceDuration => 'Durée du silence';
+
+  @override
+  String get sttSilenceDurationDescription =>
+      'Temps d\'attente après le silence avant d\'arrêter automatiquement l\'enregistrement';
+
   @override
   String get ttsEngineLabel => 'Moteur';
 

lib/l10n/app_localizations_it.dart

@@ -964,6 +964,13 @@ class AppLocalizationsIt extends AppLocalizations {
   String get sttServerUnavailableWarning =>
       'Collegati a un server con la trascrizione abilitata per usare questa opzione.';
 
+  @override
+  String get sttSilenceDuration => 'Durata del silenzio';
+
+  @override
+  String get sttSilenceDurationDescription =>
+      'Tempo di attesa dopo il silenzio prima di fermare automaticamente la registrazione';
+
   @override
   String get ttsEngineLabel => 'Motore';