Hi,
I finally found it, thank you. I think I was looking into the wrong folder.
However if you want to remove the email address from the contact-us form, the file to be updated is ps_contactinfo-rich.tpl and not ps_contactinfo.tpl. They both are in the same folder:
root_dir/themes/classic/modules/ps_contactinfo/ps_contactinfo.tpl for the footer
root_dir/themes/classic/modules/ps_contactinfo/ps_contactinfo-rich.tpl for the contact-us form