Moved as a separate issue from https://github.com/backdrop/backdrop-issues/issues/1399#issuecomment-201...
...which also brings me to the "more details" dialog:
Again here, it should change to "1 installation" because people might confuse it with an action the way it is now.
I also thing that we should be more verbose (like "x reported installations") and perhaps add download count in last week/month. Then we should move that info in a second line below the "last updated" line.
To the right (where the reported installation is currently), we should add a "Add to installation queue" button. People now have to close the dialog and make a second click in order to do that. This is also prone to error because they might click on another "Add to installation queue" link in the list after they have closed the dialog.
The dialog title should change to "Module/Theme/Layout details" or "Project details".
Here's a mockup of what I'm proposing: