We have three filters: "pending", "all" and "reviewed". Where "pending"
is the default one.
Now we are rendering the `shared/_filter_subnav` partial we need to stub
helper methods defined at the controller and the helper methods that
rely on the request parameters to test the component.
This class provides a method which shows whether a certain process is
enabled.
Even if it uses a helper, this class is inside the models folder because
the helper it uses actually only uses model methods. We might eventually
remove/simplify this helper and cache inside the model, like we did with
I18n content translations in commit 41dba842a.
