sorry, but I still got no such project where I could using multi lang... But I just open API in
http://nabovyan.xyz/telegram-node-bot/Ivan.html and think there is all details that you need. You need to start your own storage. Its easy to do in JSON format. But unlike as normal storage locatisations strorage set method will return an error. If you look on get method, you can understand how it mechanic. use TDD if you dont know how to start