Thank you for the insight. Have a Lingot :)

हर means 'every'. 'All' would be more सब (I think). I understand that in this sentence the meaning would be the same with either, it's they just want a direct word-for-word translation.

That should also be accepted. Because the course is still in beta, all the alternate translations might not be there. Please use the report feature whenever you come across such cases and we will add them by and by. :)