Optimized translate module (#4044)

* combine dtable translate

* update cdoc html

* optimized code

frontend/src/i18n-seafile-editor.js

@@ -0,0 +1,40 @@
+import i18n from 'i18next';
+import Backend from 'i18next-xhr-backend';
+import LanguageDetector from 'i18next-browser-languagedetector';
+import { initReactI18next } from 'react-i18next';
+import { mediaUrl } from './utils/constants';
+
+const lang = window.app.pageOptions.lang;
+
+i18n
+  .use(Backend)
+  .use(LanguageDetector)
+  .use(initReactI18next)
+  .init({
+    lng: lang,
+    fallbackLng: 'en',
+    ns: ['translations'],
+    defaultNS: 'translations',
+
+    whitelist: ['en', 'zh-CN', 'fr', 'de', 'cs', 'es', 'es-AR', 'es-MX', 'ru'],
+
+    backend: {
+      loadPath: mediaUrl + 'assets/frontend/locales/{{ lng }}/{{ ns }}.json',
+      // loadPath: '/media/locales/{{lng}}/{{ns}}.json',
+    },
+
+    debug: false, // console log if debug: true
+
+    interpolation: {
+      escapeValue: false, // not needed for react!!
+    },
+
+
+    load: 'currentOnly',
+
+    react: {
+      wait: true,
+    }
+  });
+
+export default i18n;