Notifications: Remove the username from the new user notification email.

Removes the username from the "Login Details" email sent to a user when their account is created (`wp_new_user_notification()`).

Props masteradhoc, cweiske.
Fixes #63085.


git-svn-id: https://develop.svn.wordpress.org/trunk@62590 602fd350-edb4-49c9-b593-d223f7449a82

Author: cbravobernal

src/wp-includes/pluggable.php

@@ -2372,9 +2372,7 @@ function wp_new_user_notification( $user_id, $deprecated = null, $notify = '' )
 
 		$switched_locale = switch_to_user_locale( $user_id );
 
-		/* translators: %s: User login. */
-		$message  = sprintf( __( 'Username: %s' ), $user->user_login ) . "\r\n\r\n";
-		$message .= __( 'To set your password, visit the following address:' ) . "\r\n\r\n";
+		$message  = __( 'To set your password, visit the following address:' ) . "\r\n\r\n";
 
 		/*
 		 * Since some user login names end in a period, this could produce ambiguous URLs that