blocklayered sort by name prestashop 1.6

[robertocommerce]

Hi everyone, I ask you, please, help to the whole community to help me solve this annoying problem.
 
I have prestashop 1.6.0.13 and many attributes for my products, I do not understand how to automatically sort the attributes ( in blocklayered module front office) by name without having to manually manage in back office why they are displayed for id, I tried to replace the line in the file blocklayered.php
 

ORDER BY id_attribute_group, id_attribute ';

with
 

ORDER BY agl.`id_attribute_group`, al.`name` ASC';

but it does not work 

 

Could you please help me?

Edited August 31, 2015 by robertocommerce (see edit history)

[robertocommerce]

Up please!!.. anyone can help?