Review please.

1. Please don't use deprecated modules - line 1 `AppController.js` - line 4-5 `net/DeviceMonitor.js` - line 3 `net/NetworkMonitor.js` - line 11 `prefs.js` - line 1 `utils/DateTimeUtils.js` [EGO Review Guidelines: deprecated modules](https://gjs.guide/extensions/review-guidelines/review-guidelines.html#do-not-use-deprecated-modules) 2. No need to use `this.initTranslation()`: - line 17 `extension.js` > Consider this method deprecated. > Only specify gettext-domain in metadata.json. > GNOME Shell can automatically initiate the translation for you > when it sees the gettext-domain key in metadata.json. [Port Guide 45: Extension Utils](https://gjs.guide/extensions/upgrading/gnome-shell-45.html#extensionutils) 3. Also null out `GnsExtension.instance` in disable. 4. Please don't store any instance of objects in a property in the default class you are exporting (You are doing that in `prefs.js`) that won't allow the garbage collector to do its job after window close: [EGO Review Guidelines: Destroy](https://gjs.guide/extensions/review-guidelines/review-guidelines.html#destroy-all-objects) If you don't want to move them to another class or make it local to `fillPreferencesWindow()` function, you can clean up on: ```js window.connect('close-request', () => { // clean up here }); ``` 5. Gjs already has these functions (line 12 and 23 `utils/DateTimeUtils.js`). No need to implement it again. 6. Please remove `utils/GtkUtils.js`. This package is gtk4 only. 7. Please null out the instance in disable (line 10 `utils/Logger.js`).