fixed css class

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

core/src/main/java/de/srsoftware/umbrella/core/model/IdOrString.java

@@ -1,14 +1,13 @@
 /* © SRSoftware 2025 */
 package de.srsoftware.umbrella.core.model;
 
+import static de.srsoftware.tools.Optionals.isSet;
+
 import de.srsoftware.tools.Mappable;
 import de.srsoftware.umbrella.core.constants.Field;
 import java.util.HashMap;
 import java.util.Map;
 
-import static de.srsoftware.tools.Optionals.isSet;
-import static de.srsoftware.tools.Optionals.nullIfEmpty;
-
 public class IdOrString implements Mappable {
 		private final Long id;
 		private final String value;

frontend/src/Components/MarkdownEditor.svelte

@@ -155,7 +155,7 @@
     {/if}
 {:else}
     <Display classes={{editable}} markdown={value} {onclick} {oncontextmenu} title={t('right_click_to_edit')} wrapper={type} />
-    {#if !value.display}
+    {#if !value.rendered}
     <button onclick={oncontextmenu}>{t('add_object',{object:t('content')})}</button>
     {/if}
 {/if}