[ufmace]

Short version - if you have to ask the question, then the answer is no.

More fully, what's your customer acquisition pipeline like? How many people on your team are fluent in another language? If the answers are "we don't know yet" and "none, except I think one guy speaks a little X", then I18N is the last thing you should be thinking about. You have access to a plenty big market just working in English, figure out how you're going to get customers and what they want first. Establish yourself as a viable business. Get as many customers as you can with your English-only app.

Once you know how to get English-speaking customers and what they want, you can at least make a reasonable estimate on what will be required to get international customers. You should already have some English-speaking customers in any country worth targeting for a more directed sales effort. That'll at least give you a starting point for people to talk to to figure out how to service those customers better and what you might need to change to operate more effectively in that country. This may include actual good translations, units and date handling, any cultural differences, legal and tax compliance, accepting foreign currency for payments and how to handle that, etc.