Iterate on UI of parental controls app

This makes the parental controls app more closely match the designs:

• https://www.dropbox.com/sh/5xr7fczica0jgh8/AAC-32sFOZGfHIHasqjF3k8sa/wireframes/Upstream_Latest.png?dl=0
• https://www.dropbox.com/sh/5xr7fczica0jgh8/AACFUjjm8QBn5gw04QX6IOrva/wireframes/Basic%20MVP.png?dl=0
• https://www.dropbox.com/sh/5xr7fczica0jgh8/AAD9ZBSEcieNr86Ig8V7vRiZa/wireframes/Stretch.png?dl=0

It depends on !20 (merged).