Add titles to HTML used in about window

With voice over enabled the titles will be read aloud, so it makes sense to set them to something sensible.
Do not call unimplemented method on super

This was broken by commit 5edd3479badb.
Remove unused code
Only draw table view as key when linked search field has focus
Ensure scope bar has one button selected

It was possible to press the already selected button to deselect it. Now we reselect it, when that happens.
Checkin release notes