[editor] Rename likert to Optionentabelle

In the UI. Internally it is still likert.

projects/editor/src/app/unit-view/page-view/new-ui-element-panel/ui-element-toolbox.component.html

@@ -73,7 +73,7 @@
     <button mat-raised-button (click)="addUIElement('likert')"
             draggable="true" (dragstart)="$event.dataTransfer?.setData('elementType','likert')">
       <mat-icon>toc</mat-icon>
-      Likert
+      Optionentabelle
     </button>
   </mat-tab>
 </mat-tab-group>