refactor: use english for routes, parameters and internal messages

src/Booking/BoardPresenter.php

@@ -98,11 +98,11 @@ final readonly class BoardPresenter
      */
     public static function urlParameters(ResourceType $type, \DateTimeImmutable $date, TimeRange $time): array
     {
-        $parameters = ['type' => $type->slug(), 'tag' => $date->format('Y-m-d')];
+        $parameters = ['type' => $type->value, 'date' => $date->format('Y-m-d')];
 
         if (!$time->isAllDay()) {
-            $parameters['von'] = $time->start();
-            $parameters['bis'] = $time->end();
+            $parameters['from'] = $time->start();
+            $parameters['to'] = $time->end();
         }
 
         return $parameters;