No placeholder text for group member add field

[jomaxro (Joshua Rosenfeld)]

This has been bugging me for awhile now, figured I’d submit a PR to fix it. With a quick glance, it’s easy to overlook the ability to add members via the groups admin UI. This PR adds placeholder text to the add members field.

Add placeholder text to group member add field

Before:

After:

[jomaxro (Joshua Rosenfeld)]

The PR has been merged.