Show screenshots for all platforms

[Volker88]

I just opened a PR to switch between the different locales for screenshots.

But couldn't yet figure out how to fetch screenshots of all platforms an app is supporting.

[Volker88]

Just noticed for my app where I support iOS, iPad and WatchOS, all screenshots are shown.

for my app supporting macOS, visionOS, iOS, iPad and watchOS, only macOS screenshots are shown