Screen reader improvements

[Vidalia]

Tested with the NVDA screen reader. While screen readers recognise section cards on the screen, their presentation sounds clunky.

• Card titles are read out twice
• Section progress badges are read out with no context: "0% Section 2" should be read out as "0% items completed Section 2"
• Where progress is a count of items, the screen reader doesn't understand the slash. "0 / 5" is read out as "0 5", but should be "0 out of 5 items completed"
• Or, more ideally, the order should be reversed and the screen reader should start with the section title "Section 2, 0% items completed"