Full width fields

* refactors full width fields from BaseModalForm into BaseForm to have this nice little feature for regular forms as well!

intervention/forms.py

@@ -175,6 +175,9 @@ class NewInterventionForm(BaseForm):
         )
     )
 
+    # Define w-100 for all form fields
+    full_width_fields = True
+
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self.form_title = _("New intervention")