Ticket #38578: 38578.diff

src/wp-admin/user-edit.php

@@ -281 +281 @@
         </th>
         <td>
                 <?php
-                $user_locale = get_user_option( 'locale', $profileuser->ID );
+                $user_locale = $profileuser->locale;
 
                 if ( 'en_US' === $user_locale ) { // en_US
                         $user_locale = false;