[wp-trac] [WordPress Trac] #65084: Update error message for disallowed username characters

[WordPress Trac]

#65084: Update error message for disallowed username characters
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 Reporter:  Marc4                                |       Owner:  (none)
     Type:  enhancement                          |      Status:  new
 Priority:  normal                               |   Milestone:  Awaiting
                                                 |  Review
Component:  General                              |     Version:
 Severity:  normal                               |  Resolution:
 Keywords:  has-patch reporter-feedback has-     |     Focuses:  ui-copy
  unit-tests needs-refresh                       |
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Comment (by yusufmudagal):

 Tested PR https://github.com/WordPress/wordpress-develop/pull/11668

 Before the patch, invalid username messages used "illegal characters" in
 both `register_new_user()` and
 `WP_REST_Users_Controller::check_username()`.
 After the patch, both now say "disallowed characters".

 Patch tests well for me.

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Ticket URL: <https://core.trac.wordpress.org/ticket/65084#comment:14>
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