This behavior is definitely a bug. Removing unused simulators will help with storage but it won't clear "Dead" folders from used simulators
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It's indeed logical for packages on their own repository but for local packages it makes less sense I think. At least in our context.
Anyway, thank you for the clarification, I've file a feedback FB15124276 and I'll stick with manual translations for now ;)
This is what fixed it for me, thanks !