Actual result:
No validation in the Display Name field
There is no validation in the Display Name field during Sign UP and on the "Edit Profile" page

Expected result:
The Display Name field should have validation during Sign UP

We should do the following
Verify Name Min Lenght(2chr)
Verify Name MAX Lenght(100chr)
Verify disallowed characters (!@#$)
Allow full name with hyphen or apostrophe (eg. Anne-Marie O’Connor)
Allow full name with non-Latin characters (eg. “Иван Иванов” (Cyrillic) or “张伟” (Chinese))
Allow Upper and lower cases