[bug 922412] Fix in-progress; add spinner

This nixes most of the text on the in-progress card and adds a spinner.
Users won't feel like they missed something if it goes sailing by. Plus
it indicates it's "doing something" and no user action is required.

To see the card, I open this up in responsive mode 320x480, open up the web console, then do:

```
$('x-deck')[0].shuffleNext();
```

until I get to this card which has "Submitting...." in the header.

r?