feat(client): 翻訳をIndexedDBに保存・プッシュ通知を翻訳 (#6396)

* wip

* tabun ok

* better msg

* oops

* fix lint

* Update gulpfile.ts

Co-authored-by: Acid Chicken (硫酸鶏) <root@acid-chicken.com>

* Update src/client/scripts/set-i18n-contexts.ts

Co-authored-by: Acid Chicken (硫酸鶏) <root@acid-chicken.com>

* refactor

Co-authored-by: acid-chicken <root@acid-chicken.com>

* ✨

* wip

* fix lint

* たぶんおk

* fix flush

* Translate Notification

* remove console.log

* fix

* add notifications

* remove san

* wip

* ok

* ✌️

* Update src/prelude/array.ts

Co-authored-by: Acid Chicken (硫酸鶏) <root@acid-chicken.com>

* wip

* i18n refactor

* Update init.ts

* ✌️

Co-authored-by: Acid Chicken (硫酸鶏) <root@acid-chicken.com>
Co-authored-by: syuilo <syuilotan@yahoo.co.jp>

src/client/components/poll-editor.vue

@@ -51,7 +51,6 @@
 <script lang="ts">
 import Vue from 'vue';
 import { faExclamationTriangle, faTimes } from '@fortawesome/free-solid-svg-icons';
-import i18n from '../i18n';
 import { erase } from '../../prelude/array';
 import { addTime } from '../../prelude/time';
 import { formatDateTimeString } from '../../misc/format-time-string';
@@ -61,7 +60,6 @@ import MkSwitch from './ui/switch.vue';
 import MkButton from './ui/button.vue';
 
 export default Vue.extend({
-	i18n,
 	components: {
 		MkInput,
 		MkSelect,