Hello,
Thanks for the question about modifying the link module block name. You can actually change it within the Administrator for Prestashop. Here are the directions:
Login the PrestaShop Admin
Main Menu - Modules
Sub menu - Modules: Scroll down to Link Block and click Configure
Under Block Settings, edit the Block title with your information
Click SAVE
That should the change the title for the Link Block Module. I looked in the PrestaShop Support Forum and also found the answer here
I hope this helps to answer your question, please let us know if you require any further assistance.
Regards,
Arnel C.