Make actions private in panels and views

Change-Id: I3f2c68c6e51525bbba96c24c4fddf9f9498333b1
diff --git a/dev/js/src/plugin/server.js b/dev/js/src/plugin/server.js
index daea33c..d86eebc 100644
--- a/dev/js/src/plugin/server.js
+++ b/dev/js/src/plugin/server.js
@@ -214,7 +214,7 @@
 
           // Add to static button list (e.g. for query) already loaded
           else if (KorAP.Panel[panel]) {
-            KorAP.Panel[panel].actions.add(title, obj, cb);
+            KorAP.Panel[panel].actions().add(title, obj, cb);
           }
 
           // Add to static button list (e.g. for query) not yet loaded
@@ -235,7 +235,7 @@
 
           // TODO:
           //   Lazy registration (see above!)
-          KorAP.Panel[panel].actions.addToggle(title, {'cls':["title"]}, state);
+          KorAP.Panel[panel].actions().addToggle(title, {'cls':["title"]}, state);
 
           // Add the service
           let id = this.addService({