(New) Add option to use the floating screen off button without notification. However, the button may stop working if your device is running out of memory.
(Improved) Changing language in setting will take effect immediately
(Fixed) Align some text between the free and donate version
(Fixed) Fixed custom lock/unlock sound broken in Android 4.4
Note: Additional permission is needed since it is a requirement in Android 4.4 for the app to load the lock/unlock audio file located in ext. storage