roomplan persistence

src/main/resources/templates/room.html

@@ -2,11 +2,15 @@
 {#room_active}active{/}
 {#contents}
 
+<div class="mt-2">
+  <img src="/room/plan" alt="kein Raumplan vorhanden">
+</div>
+
 {#if is_admin}
 <div class="mt-2">
   <form action="/room/plan" method="POST" enctype="multipart/form-data">
       <label id="filelabel" class="btn btn-secondary" for="fileinput">
-        Raumplan auswählen...
+        neuen Raumplan auswählen...
       </label>
       <input id="fileinput" type="file" name="file" accept="image/*" hidden
              onchange="document.getElementById('filelabel').innerHTML = 'Datei: ' + this.files[0].name;" />