We're going to add some JavaScript which affect this component, and IMHO
it will be easier to know the JavaScript affects this form if both have
their own separate file.
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.
