Display "Saved" after accepting changes

[tgilcrest]

It would help users to give an indication that their changes are saved after accepting. A possible implementation that could work is to show "Saved" after the spinner disappears on a successful PATCH request.

After hitting Accept, see the spinner:

After the request completes successfully, see "Saved", something like this:

When a new selection is made, remove Saved and show Accept/Cancel:

Unclear what should happens if the user hits cancel. Could see an argument for it either way.