feat: Avatar decoration (#12096)

* wip

* Update ja-JP.yml

* Update profile.vue

* .js

* Update home.test.ts

packages/backend/src/di-symbols.ts

@@ -18,6 +18,7 @@ export const DI = {
 	announcementsRepository: Symbol('announcementsRepository'),
 	announcementReadsRepository: Symbol('announcementReadsRepository'),
 	appsRepository: Symbol('appsRepository'),
+	avatarDecorationsRepository: Symbol('avatarDecorationsRepository'),
 	noteFavoritesRepository: Symbol('noteFavoritesRepository'),
 	noteThreadMutingsRepository: Symbol('noteThreadMutingsRepository'),
 	noteReactionsRepository: Symbol('noteReactionsRepository'),