You are building a non-SPA project, so you can use the below node modules, the react itself has an i18n module, so you can try it for multilingual. you need to manage all translations in the JSON inside the public folder something like this /public/locales/en/translation.json
Why I am proposing this, the translation's will not change very frequently, even if it changes also in AEM you need to get developer help to update and send it as JSON format, I feel instead of writing exporting logic for this in AEM, you can handle directly in react itself.
i18n(I18n) is a server side object, you will not be able to access it from frontend(ReactJS). What you can do you get the i18n object in Sling Model and expose it to the frontend as JSON using Sling Model exporter.