Confusing labels when creating a new user

[filosofo]

When you create a new user at the bottom of wp-admin/users.php, the form doesn't tell you that the "nickname" and "e-mail" fields are required.

Also, if you leave "Nickname" empty, you get this error message: "ERROR: Please enter a username."

My patch renames "Nickname" to "Username (required)" and "E-mail" to "E-mail (required)"

[markjaquith]

+1 (duplicate of #2540 but I like your patch better)

[ryan]

(In [4136]) Rename Nickname to Username and mark Username and E-mail as required. Props filosofo. fixes #2940