feat: Migrate to Nuxt 3 framework (#5184)

Co-authored-by: Michael Genson <71845777+michael-genson@users.noreply.github.com>
Co-authored-by: Kuchenpirat <24235032+Kuchenpirat@users.noreply.github.com>

frontend/lang/locales/en-US.ts

@@ -0,0 +1,9 @@
+// File was already correctly named
+export default defineI18nLocale(async () => {
+  const { en: $vuetify } = await import("vuetify/locale");
+  const { default: enUS } = await import("../messages/en-US.json");
+  return {
+    ...enUS,
+    $vuetify,
+  };
+});