If you build the service in 10 languages right away, you’ll struggle to maintain it. Every interface change means updating translation files across all languages, even though most of your users will likely understand an English interface anyway. But if you’re building for a specific country, build it in that country’s language and don’t add English. Even two languages at the start are worse than one. With a single language, you can keep text directly in the code instead of splitting it into separate translation files.
My blog: orchidfiles.com