[C2] Add category.variable in settings page #6807
Description
When debugging the platform, it is useful to know what setting we are looking at in the administration section.
Currently, you can open the browser inspector and find the id of the form element to know what each setting is, but it still requires to know in which category we are etc.
Only when platform.server_type == 'dev', add an icon with a title on hover, like in the screenshots below, with the $category.'.'.$variable as the title of the (dead) link (or avoid using the <a> altogether if possible.
If there is a "Show JSON Template" link already on the right put the new icon more to the right. See classes used in the screenshot from the inspector to make it relatively discrete.