fix: translate & main audio volume

lib/core/constants/my_constants.dart

@@ -15,5 +15,5 @@ class MyConstants {
   static const String currentLevel = 'CURRENT_LEVEL';
   static const String mainAudioService = 'MAIN_AUDIO_SERVICE';
   static const String effectAudioService = 'EFFECT_AUDIO_SERVICE';
-  static const double mainAudioVolume = 0.5;
+  static const double mainAudioVolume = 0.3;
 }

lib/l10n/app_localizations.dart

@@ -259,7 +259,7 @@ abstract class AppLocalizations {
   /// No description provided for @exit_dialog_desc.
   ///
   /// In en, this message translates to:
-  /// **'Come back, hero!\\nThe adventure isn’t over yet'**
+  /// **'Come back, hero!\nThe adventure isn’t over yet'**
   String get exit_dialog_desc;
 
   /// No description provided for @cancel.

lib/l10n/app_localizations_en.dart

@@ -96,7 +96,7 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String get exit_dialog_desc =>
-      'Come back, hero!\\nThe adventure isn’t over yet';
+      'Come back, hero!\nThe adventure isn’t over yet';
 
   @override
   String get cancel => 'Cancel';