Ask HN: How do people create internationalization store image assets across different platforms?

So, this is totally just a technical design issue. I wonder how other startups are dealing with it. Basically, we have apps on iOS, Android and Windows, and we have 20 languages used in the screenshots. iOS store alone has 5 screen sizes, so we need to create 5 * 20 * 5 = 500 screenshots. I know there are some automation tools out there, but which one is the easiest for designer to set it up and being able to track all the histories and changes? We are thinking to build an internal image synthesis tool just for this now. Wonder what's the thoughts from the community?