Intervention template adjustments

* renames intervention variable to obj to match other template style
* renames open routes to detail routes

ema/forms.py

@@ -99,7 +99,7 @@ class EditEmaForm(NewEmaForm):
         self.form_title = _("Edit EMA")
 
         self.action_url = reverse("ema:edit", args=(self.instance.id,))
-        self.cancel_redirect = reverse("ema:open", args=(self.instance.id,))
+        self.cancel_redirect = reverse("ema:detail", args=(self.instance.id,))
 
         self.fields["identifier"].widget.attrs["url"] = reverse_lazy("ema:new-id")
         self.fields["title"].widget.attrs["placeholder"] = _("Compensation XY; Location ABC")