Bug 1055356 - Make the 'unread' flag and contact photo screen reader vis...

...ible.
Well, this ```aside``` is a bit tricky (that I don't really like, but it's just legacy) - it can have 3 states:
* Read - here we don't display anything for user or screen reader (```visibility:hidden``` works here);
* Unread - here we display blue dot, using ```aria-label="Unread"``` and ```visibility:visible```;
* Draft - here we display pencil, we need ```aria-label="Draft"``` and ```visibility: visible```;

So this patch covers only first two cases, can you make the 3rd case work too?