Improve the Account access dialog

This dialog has a couple of usability problems that are immediately apparent: The reason (if given) is haphazardly thrown at the end, which isn't very nice. The user name and real name of the account is duplicated, and it's also not in line with your avatar which makes it look odd. More importantly, the app name is not displayed anywhere so it's impossible for the user to audit who is creating this dialog - something we constantly get complaints about with our other access dialogs.

This change hopes to address all of these issues, by re-arranging the dialog and adding the requesting application name. The dialog is still functionally the same as before.

Before

Without Reason	With Reason

After

Without Reason	With Reason