I think you misunderstood what I said. I don't mean translating the admin control panel.I mean translating the NodeBB itself which also is possible as a project on Transifex. In fact I am looking for another way. then I thought there might be a plugin for doing this which is my question. Thanks a lot.
@RichG Embedly has a pretty decent API which you can potentially call from the NodeBB server instance - it will give you a fair bit of data from the page that you're trying to embed, in JSON format. Up to you how to use that data.
Once I have a stable and scalable "vanilla" NodeBB, want to look at using their API on NodeBB.