GUI for Participant management

app/Resources/LocalGroupResource.php

@@ -17,6 +17,7 @@ class LocalGroupResource extends JsonResource {
             'email' => $this->resource->email,
             'city' => $this->resource->city,
             'postalcode' => $this->resource->postcode,
+            'slug' => $this->resource->slug,
         ];
     }
 }