Change default registration errors

I’m trying to change the WordPress default errors people see when try to register.

I’m trying to remove the wordpress original function and create a new one, using this code, but not effect. Any idea what I’m doing wrong?

    /*Change default registration WordPress errors*/     remove_filter( 'registration_errors', 'registration_errors' );     add_filter( 'registration_errors', 'registration_errors_so_16002591' );  function registration_errors_so_16002591( $  errors ) {         if( isset( $  errors->errors['email_exists'] ) ) {         $  errors->errors['email_exists'][0] = 'email already<strong>taken</strong>';     }     if( isset( $  errors->errors['username_exists'] ) ) {         $  errors->errors['username_exists'][0] = 'nick <strong>picken</strong>';     }     // Other errors     // ['empty_email']     // ['empty_username']      return $  errors; }