Rename 'Zahlenstrahl' to 'Schieberegler'

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

@@ -78,7 +78,7 @@
     <button mat-raised-button (click)="addUIElement('slider')"
             draggable="true" (dragstart)="$event.dataTransfer?.setData('elementType','slider')">
       <mat-icon>linear_scale</mat-icon>
-      Zahlenstrahl
+      Schieberegler
     </button>
   </mat-tab>
 </mat-tab-group>