visual of restricted architectures in archives +edit is not that clear

[Mattia Rizzolo]

The visual hint on which architectures can be enabled is too subtle, as the only difference is the check box being grayed out, and the check box being tiny and the difference hard to notice when all available architectures are enabled.

It would be handy if there was also more clear visual hints about this, dunno... something like a tiny prohibition sign or something... or maybe crossing the unavailable archs or paint them gray..
I'm not a graphic :)