* Name change: better unicode handling
Client-side:
* Changes the NameChangeModal to show text "Over limit" when a proposed display
name is too long.
* Allows names to go over limit to prevent splitting graphemes on input.
Server-side:
* Changes the MakeSafeStringOfLength to count number of unicode code points
instead of string bytes.
* name modal: check that newName is defined before iterating
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