Suggestion for required fields

What does this MR do?

This is a small update to the message text we present in the UI when a field is required.

It changes the recommendation from "Your display name can’t be blank" to "Display name is required."

I'm requesting this change because I feel like it's more succinct and closer to industry standards.

This issue came up when I was reviewing this MR.

Does this MR meet the acceptance criteria?

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