Resurrect Service Worker (#7108)

* Resolve #7106

* fix lint

* fix lint

* save lang in idb

* fix lint

* fix

* cache locale file

* fix lint

* ✌️

* wip

* fix [wip]

* fix [wip]

Co-authored-by: syuilo <Syuilotan@yahoo.co.jp>

src/client/init.ts

@@ -57,6 +57,7 @@ import { fetchInstance, instance } from '@/instance';
 import { makeHotkey } from './scripts/hotkey';
 import { search } from './scripts/search';
 import { getThemes } from './theme-store';
+import { initializeSw } from './scripts/initialize-sw';
 
 console.info(`Misskey v${version}`);
 
@@ -171,7 +172,7 @@ fetchInstance().then(() => {
 	localStorage.setItem('v', instance.version);
 
 	// Init service worker
-	//if (this.store.state.instance.meta.swPublickey) this.registerSw(this.store.state.instance.meta.swPublickey);
+	initializeSw();
 });
 
 stream.init($i);