Add new settings tab for participation processes

- Rename setting keys
- New tab por participation processes
- Hide these settings from features tab

spec/features/admin/legislation/questions_spec.rb

@@ -17,7 +17,7 @@ feature "Admin legislation questions" do
   context "Feature flag" do
 
     background do
-      Setting["feature.legislation"] = nil
+      Setting["process.legislation"] = nil
     end
 
     scenario "Disabled with a feature flag" do