Fix GeoGebra cutomToolbar property to have consistent naming

Toolbar is a single word, therefore any capitalized letters are errors. 
No need to sanitize, since this was broken anyway.

#384

projects/common/components/geometry/geometry.component.ts

@@ -96,7 +96,7 @@ export class GeometryComponent extends ElementComponent implements AfterViewInit
       enableShiftDragZoom: this.elementModel.enableShiftDragZoom,
       showZoomButtons: this.elementModel.showZoomButtons,
       showFullscreenButton: this.elementModel.showFullscreenButton,
-      customToolBar: this.elementModel.customToolBar,
+      customToolBar: this.elementModel.customToolbar,
       enableUndoRedo: this.elementModel.enableUndoRedo,
       showResetIcon: false, // use custom html button icon
       showMenuBar: false,

projects/common/models/elements/geometry/geometry.ts

@@ -16,7 +16,7 @@ export class GeometryElement extends UIElement implements PositionedUIElement {
   enableShiftDragZoom: boolean = true;
   showZoomButtons: boolean = true;
   showFullscreenButton: boolean = true;
-  customToolBar: string = '';
+  customToolbar: string = '';
   position: PositionProperties;
 
   constructor(element: Partial<GeometryElement>) {
@@ -30,7 +30,7 @@ export class GeometryElement extends UIElement implements PositionedUIElement {
     this.enableShiftDragZoom = element.enableShiftDragZoom !== undefined ? element.enableShiftDragZoom : true;
     this.showZoomButtons = element.showZoomButtons !== undefined ? element.showZoomButtons : true;
     this.showFullscreenButton = element.showFullscreenButton !== undefined ? element.showFullscreenButton : true;
-    this.customToolBar = element.customToolBar !== undefined ? element.customToolBar : '';
+    this.customToolbar = element.customToolbar !== undefined ? element.customToolbar : '';
 
     this.position = UIElement.initPositionProps({ ...element.position });
   }

projects/editor/src/app/components/properties-panel/model-properties-tab/element-model-properties.component.html

@@ -209,12 +209,12 @@
     {{'propertiesPanel.showFullscreenButton' | translate }}
   </mat-checkbox>
 
-  <mat-form-field *ngIf="combinedProperties.customToolBar != null"
+  <mat-form-field *ngIf="combinedProperties.customToolbar != null"
                   matTooltip="{{'propertiesPanel.customToolbarHelp' | translate }}"
                   appearance="fill">
     <mat-label>{{'propertiesPanel.customToolbar' | translate }}</mat-label>
     <input matInput [value]="$any(combinedProperties.customToolbar)"
-           (input)="updateModel.emit({ property: 'customToolBar', value: $any($event.target).value })">
+           (input)="updateModel.emit({ property: 'customToolbar', value: $any($event.target).value })">
   </mat-form-field>
 
   <mat-checkbox *ngIf="combinedProperties.enableModeSwitch !== undefined"

projects/editor/src/assets/i18n/de.json

@@ -187,7 +187,7 @@
     "showZoomButtons": "Zoom-Knöpfe anzeigen",
     "showFullscreenButton": "Vollbild-Knopf anzeigen",
     "enableShiftDragZoom": "Bewegen und Zoom erlauben",
-    "customToolBar": "Anpassung Werkzeugleiste",
+    "customToolbar": "Anpassung Werkzeugleiste",
     "customToolbarHelp": "Hier kann definiert werden, welche Elemente auf der Werkzeigleiste angezeigt werden sollen. Für Details bitte die Dokumentation konsultieren.",
     "hotspots": "Aktive Bereiche",
     "newHotspot": "Neuer Bereich",