adjust frontend to changes in the backed (removal of google data)

Closes #2071

docs/plugins/events.md

@@ -9,18 +9,17 @@ To listen for specific events, plugins can use the `addListener` method in `even
 
 - onAddDataOverlay - triggered after successfully adding an overlay; the created overlay is passed as an argument. Example argument:
 
-```javascript
+```json
 {
-   "name": "Example Overlay",
-   "googleLicenseConsent": false,
-   "creator": "appu-admin",
-   "description": "Different",
-   "genomeType": null,
-   "genomeVersion": null,
-   "idObject": 149,
-   "publicOverlay": false,
-   "type": "GENERIC",
-   "order": 9
+  "name": "Example Overlay",
+  "creator": "appu-admin",
+  "description": "Different",
+  "genomeType": null,
+  "genomeVersion": null,
+  "idObject": 149,
+  "publicOverlay": false,
+  "type": "GENERIC",
+  "order": 9
 }
 ```
 
@@ -32,10 +31,9 @@ To listen for specific events, plugins can use the `addListener` method in `even
 
 - onShowOverlay - triggered after displaying an overlay on the map; the displayed overlay is passed as an argument. Example argument:
 
-```javascript
+```json
 {
   "name": "Generic advanced format overlay",
-  "googleLicenseConsent": false,
   "creator": "appu-admin",
   "description": "Data set provided by a user",
   "genomeType": null,
@@ -49,10 +47,9 @@ To listen for specific events, plugins can use the `addListener` method in `even
 
 - onHideOverlay - triggered after disabling an overlay on the map; the disabled overlay is passed as an argument. Example argument:
 
-```javascript
+```json
 {
   "name": "colored overlay",
-  "googleLicenseConsent": false,
   "creator": "appu-admin",
   "description": "",
   "genomeType": null,