Use short name in AK plan

AKPlan/templates/AKPlan/encode_events.html

@@ -5,7 +5,7 @@
     {% for slot in slots %}
         {% if slot.start %}
             {
-                'title': '{{ slot.ak.name }}',
+                'title': '{{ slot.ak.short_name }}',
                 'start': '{{ slot.start | timezone:event.timezone | date:"Y-m-d H:i:s" }}',
                 'end': '{{ slot.end | timezone:event.timezone | date:"Y-m-d H:i:s" }}',
                 'resourceId': '{{ slot.room.title }}',