Add indicator for "un/published"

@thomas.frobieter I think this is indeed still a very helpful one and a quickwin to be able to see if a media was unpublished in the frontend.

Might otherwise confuse side admins, if they see an image, which users can't see?
Or is this already solved for all media types?

Not solved yet.

Automatically closed - issue fixed for 2 weeks with no activity.