Anyone have experience running a niche site in a language they don't know?

I know this sounds a little ridiculous but lets say that you are an expert in something that isn't very niche or difficult to learn about in English but the market is not so saturated in other countries. If I could find someone to reliably translate my information (either outsource or partner with someone) do you think I could effectively sell an ebook? Any tips on how I would research the market of a foreign country?