chore: Nuxt 4 upgrade (#7426)

frontend/app/tests/utils.ts

@@ -0,0 +1,16 @@
+import { createI18n } from "vue-i18n";
+
+function loadEnLocales() {
+  // eslint-disable-next-line @typescript-eslint/no-require-imports
+  return require("../lang/messages/en-US.json") as Record<string, string>;
+}
+
+export function stubI18n() {
+  const i18n = createI18n({
+    locale: "en-US",
+    messages: {
+      "en-US": loadEnLocales(),
+    },
+  });
+  return i18n.global;
+}