init template. not completed.

QuasarFrontend/src/boot/i18n.ts

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+import { defineBoot } from '#q-app/wrappers';
+import { createI18n } from 'vue-i18n';
+
+import messages from 'src/i18n';
+
+export type MessageLanguages = keyof typeof messages;
+// Type-define 'en-US' as the master schema for the resource
+export type MessageSchema = (typeof messages)['en-US'];
+
+// See https://vue-i18n.intlify.dev/guide/advanced/typescript.html#global-resource-schema-type-definition
+/* eslint-disable @typescript-eslint/no-empty-object-type */
+declare module 'vue-i18n' {
+  // define the locale messages schema
+  export interface DefineLocaleMessage extends MessageSchema {}
+
+  // define the datetime format schema
+  export interface DefineDateTimeFormat {}
+
+  // define the number format schema
+  export interface DefineNumberFormat {}
+}
+/* eslint-enable @typescript-eslint/no-empty-object-type */
+
+export default defineBoot(({ app }) => {
+  const i18n = createI18n<{ message: MessageSchema }, MessageLanguages>({
+    locale: 'en-US',
+    legacy: false,
+    messages,
+  });
+
+  // Set i18n instance on app
+  app.use(i18n);
+});