make formula deletion page clearer

core/templates/core/delete_confirm.jinja

@@ -21,6 +21,8 @@
   <h2>{% trans %}Delete confirmation{% endtrans %}</h2>
   <form action="" method="post">{% csrf_token %}
     <p>{% trans name=object_name %}Are you sure you want to delete "{{ name }}"?{% endtrans %}</p>
+    {% if help_text %}<p><em>{{ help_text }}</em></p>{% endif %}
+    <br/>
     <input type="submit" value="{% trans %}Confirm{% endtrans %}" />
   </form>
   <form method="GET" action="javascript:history.back();">

counter/views/admin.py

@@ -166,7 +166,9 @@ class ProductEditView(CounterAdminTabsMixin, CounterAdminMixin, UpdateView):
 
 class ProductFormulaListView(CounterAdminTabsMixin, PermissionRequiredMixin, ListView):
     model = ProductFormula
-    queryset = ProductFormula.objects.select_related("result")
+    queryset = ProductFormula.objects.select_related("result").prefetch_related(
+        "products"
+    )
     template_name = "counter/formula_list.jinja"
     current_tab = "formulas"
     permission_required = "counter.view_productformula"
@@ -206,6 +208,17 @@ class ProductFormulaDeleteView(
     success_url = reverse_lazy("counter:product_formula_list")
     permission_required = "counter.delete_productformula"
 
+    def get_context_data(self, **kwargs):
+        obj_name = self.object.result.name
+        return super().get_context_data(**kwargs) | {
+            "object_name": _("%(formula)s (formula)") % {"formula": obj_name},
+            "help_text": _(
+                "This action will only delete the formula, "
+                "but not the %(product)s product itself."
+            )
+            % {"product": obj_name},
+        }
+
 
 class ReturnableProductListView(
     CounterAdminTabsMixin, PermissionRequiredMixin, ListView

locale/fr/LC_MESSAGES/django.po

@@ -3843,6 +3843,20 @@ msgstr "Temps"
 msgid "Top 100 barman %(counter_name)s (all semesters)"
 msgstr "Top 100 barman %(counter_name)s (tous les semestres)"
 
+#: counter/views/admin.py
+#, python-format
+msgid "%(formula)s (formula)"
+msgstr "%(formula)s (formule)"
+
+#: counter/views/admin.py
+#, python-format
+msgid ""
+"This action will only delete the formula, but not the %(product)s product "
+"itself."
+msgstr ""
+"Cette action supprimera seulement la formule, mais pas le produit "
+"%(product)s en lui-même."
+
 #: counter/views/admin.py
 #, python-format
 msgid "returnable product : %(returnable)s -> %(returned)s"