feat: add flash messages to cancel membership and update wording

Enhanced the `cancelMembership` action to show flash messages to provide feedback. Also changed the wording to be more descriptive as to what action was actually performed and to be in Dutch like the rest of the UI.

src/Controller/Admin/MemberCrud.php

@@ -14,6 +14,7 @@
 use EasyCorp\Bundle\EasyAdminBundle\Dto\EntityDto;
 use EasyCorp\Bundle\EasyAdminBundle\Dto\SearchDto;
 use EasyCorp\Bundle\EasyAdminBundle\Orm\EntityRepository;
+use EasyCorp\Bundle\EasyAdminBundle\Router\AdminUrlGenerator;
 use EasyCorp\Bundle\EasyAdminBundle\Field\{ Field, IdField, BooleanField, FormField, DateField, DateTimeField, CollectionField, ChoiceField, TextField, EmailField, AssociationField, MoneyField };
 use EasyCorp\Bundle\EasyAdminBundle\Config\{ Crud, Filters, Actions, Action };
 use EasyCorp\Bundle\EasyAdminBundle\Filter\{ EntityFilter };
@@ -71,28 +72,39 @@ public function configureActions(Actions $actions): Actions {
         $actions->add(Crud::PAGE_INDEX, $action);
         $contributionEnabled = $this->getParameter('app.contributionEnabled');
         if ($contributionEnabled) {
-            $actionCancelMollie = Action::new('cancel', 'Lidmaatschap stoppen', 'fa fa-dollar-sign')
-                ->linkToCrudAction('cancelMembership')
-                ->setCssClass('btn btn-secondary');
+            $actionCancelMollie =
+                Action::new('cancel', 'Contributiebetaling stopzetten', 'fa fa-dollar-sign')
+                    ->linkToCrudAction('cancelMembership')
+                    ->setCssClass('btn btn-secondary');
             $actions->add(Crud::PAGE_EDIT, $actionCancelMollie);
         }
         return $actions;
     }
 
-    public function cancelMembership(AdminContext $adminContext, MollieApiClient $mollieApiClient): Response
+    public function cancelMembership(AdminContext      $adminContext,
+                                     MollieApiClient   $mollieApiClient,
+                                     AdminUrlGenerator $adminUrlGenerator): Response
     {
         $member = $adminContext->getEntity()->getInstance();
+        $redirectUrl = $adminUrlGenerator
+            ->setController(self::class)
+            ->setAction(Crud::PAGE_EDIT)
+            ->setEntityId($member->getId())
+            ->generateUrl();
+
         if ($member->getMollieSubscriptionId() === null)
         {
-            return new Response('Membership already cancelled');
+            $this->addFlash('warning', 'Contributiebetaling is al gestopt.');
+            return $this->redirect($redirectUrl);
         }
         $customer = $mollieApiClient->customers->get($member->getMollieCustomerId());
         $subscription = $mollieApiClient->subscriptions->getFor($customer, $member->getMollieSubscriptionId());
         $subscription->cancel();
         $member->setMollieSubscriptionId(null);
         $em = $this->getDoctrine()->getManager();
         $em->flush();
-        return new Response('Membership cancelled succesfully');
+        $this->addFlash('success', 'Contributiebetaling succesvol stopgezet.');
+        return $this->redirect($redirectUrl);
     }
 
     public function export(AdminContext $adminContext): BinaryFileResponse