CakePHP Pagination Change Label

Here we can change the displayed label for CakePHP Pagination:

Say, we want to sort results by user_id.

This is how it is done by default:

<?php echo $paginator->sort('user_id');?>

And to change the displayed label:
 <?php echo $paginator->sort('User', 'user_id');?>

Here User is the label which will be displayed.
user_id is the field to be sorted.