Missing certificate section in fortigate gui 5.2.x

I had to restore a system, and after some time I was missing the certificate options in the menu (see the picture)

In case you need to show that section, you just have to:

Fortigate# config system global Fortigate (global)# set gui-certificate enable Fortigate (global)# end 

For the whole information, this is the post where I found this http://www.bauer-power.ne...from.html#.VZUM3N89tQI