I start localizing after the product feels finished, or only translate parts that are finished and not likely to change soon. So by my rules, a prototype (that

I start localizing after the product feels finished, or only translate parts that are finished and not likely to change soon. So by my rules, a prototype (that is finished) could show working localisation with minimal effort. (Just using an array with strings instead of a full blown localisation/formatting solution.) If my product should take timezones into account, its data formats and business code are designed to account for that from the start.