Library settings editor can look odd if setting name and description are the same

[Galen Charlton]

As noted in comment 15 on bug 1999158, its modal for editing a setting can look like the heading was duplicated by mistake when the settings label and description are the same: https://launchpadlibrarian.net/665881919/visibility-issue-2.png

This isn't actually different behavior from the AngularJS library settings editor, but we could consider a couple options for improvement:

Idea 1: Add a (HTML) label for the description field in the modal.
Idea 2: Don't display the description field if it is the same as the (setting type) label.

Evergreen 3.10+