Bug after create a new site (signup.php)

Hi,

After a NEW user create a site using the signup page, appears the error:

Warning: sprintf() [function.sprintf]: Too few arguments in /home/storage/8/a4/65/wordpress9/public_html/wp-includes/ms-functions.php on line 1271

Congratulations! Your new blog is ready!

Username: xxx

Password: xxx

You're all set up and ready to go. View your site or go to the admin area.

Please, can you fix this bug? I read about it here: https://premium.wpmudev.org/forums/topic/brand-new-wp-mu-35-problems-registration-emails-and-php-warnings#post-325777 and here: https://premium.wpmudev.org/forums/topic/remove-email-verification-1

It would be good if the bug was fixed.

Thanks.