Some changes in "Add posts" window for Albums

Posts are now showing how many albums a picture is and, if you click it shows the albums in a window.

I think it could be helpful that information is shown too in posts at the window when you click “add posts” to an album, in this place:

In this way, we can see which albums the pictures are already featured or not.

Other thing would be add a button to this window to “only show pictures not assigned to any album” to help us in doing all this sorting and classification that will be a pain for creators.