support language translation.

src/config/i18n.ts

@@ -0,0 +1,27 @@
+import i18n from 'i18next';
+import { initReactI18next } from 'react-i18next';
+import kintoneLanguageDetector from '../common/kintoneLanguageDetector';
+
+import enTranslation from './locales/en.json';
+import jaTranslation from './locales/ja.json';
+
+i18n
+  .use(kintoneLanguageDetector)
+  .use(initReactI18next)
+  .init({
+    fallbackLng: 'en',
+    debug: true,
+    interpolation: {
+      escapeValue: false, // not needed for react as it escapes by default
+    },
+    resources: {
+      en: {
+        translation: enTranslation,
+      },
+      ja: {
+        translation: jaTranslation,
+      },
+    },
+  });
+
+export default i18n;