fix: accept the ISO-2 country codes when authoring a destination

src/Form/DestinationType.php

@@ -40,14 +40,7 @@ class DestinationType extends AbstractType
             ])
             ->add('country', ChoiceType::class, [
                 'label' => 'Land',
-                'choices' => [
-                    'Österreich' => 'at',
-                    'Schweiz' => 'ch',
-                    'Frankreich' => 'fr',
-                    'Italien' => 'it',
-                    'Deutschland' => 'de',
-                    'Niederlande' => 'nl',
-                ],
+                'choices' => DestinationDto::COUNTRIES,
             ])
             ->addEventListener(FormEvents::PRE_SET_DATA, function (FormEvent $event) {
                 $form = $event->getForm();