I18N Code Work done.

lib/sounds.py

@@ -1,4 +1,4 @@
-from typing import Optional, Type, cast
+from typing import Optional, Self, Type, cast
 
 from PyQt6.QtCore import QObject, Qt, QUrl, pyqtSlot
 from PyQt6.QtMultimedia import (
@@ -15,7 +15,7 @@ from PyQt6.QtMultimedia import (
 class SoundOff(QObject):
     _instance = None
 
-    def __new__(cls: Type[SoundOff]) -> SoundOff:
+    def __new__(cls: Type[Self]) -> Self:
         if cls._instance:
             return cls._instance
         cls._instance = super(SoundOff, cls).__new__(cls)