Improve label for multiple additional css classes #15634
Merged
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Description
Add clarity around additional css classes so users know that multiple
classes are supported and the proper separator between classes.
Fixes #15597
How has this been tested?
Confirm change shows as expected, includes i18n
Uses standard controls
Screenshots
Types of changes
Add "(es)" so new label is "Additional CSS Class(es)"
Add help attribute with help message: "Space separate multiple classes."
Checklist: