it-tools/src/plugins/i18n.plugin.ts

import type { App } from 'vue';
import { createI18n } from 'vue-i18n';
import messages from '@intlify/unplugin-vue-i18n/messages';

const i18n = createI18n({
  legacy: false,
  locale: 'en',
  messages,
});

export const i18nPlugin = {
  install: (app: App) => {
    app.use(i18n);
  },
};