Dashboards of users without script right have translation calls in gadget titles

Steps to reproduce:

1. As a user without script right, add a gadget in the "My dashboard" section of the user profile (like a "Page Tree").
2. Save the user profile.

Expected result:

The gadget's title is shown as "Page Tree".

Actual result:

The gadget's title is shown as "$services.localization.render('rendering.macro.documentTree.name')".

This is because the user doesn't have script right and as XWIKI-17794 has been fixed, users without script right cannot execute scripts in gadget titles anymore. While this is expected, it is not good that the gadget titles aren't displayed anymore.