frontend/src/i18n.js

import Vue from "vue";
import VueI18n from "vue-i18n";

import config from "@/config";

Vue.use(VueI18n);

const locales = require.context("./locales", true, /[A-Za-z0-9-_,\s]+\.json$/i);
const messages = {};
locales.keys().forEach((key) => {
  const matched = key.match(/([A-Za-z0-9-_]+)\./i);
  if (matched && matched.length > 1) {
    const locale = matched[1];
    messages[locale] = locales(key);
  }
});

export default new VueI18n({
  locale: config.locale.split("-")[0],
  fallbackLocale: "en",
  formatFallbackMessages: true,
  messages,
});