openolat#231: show the convert to learning path course option only to admins for now

src/main/java/org/olat/course/nodeaccess/ui/NodeAccessSettingsController.java

@@ -111,6 +111,8 @@ public class NodeAccessSettingsController extends FormBasicController {
 			FormLayoutContainer migrationCont = FormLayoutContainer.createButtonLayout("migrationButtons", getTranslator());
 			formLayout.add(migrationCont);
 			migrateLink = uifactory.addFormLink("settings.convert", migrationCont, Link.BUTTON);
+			// @UIBK: currently we only show the convert button to admins
+			migrateLink.setVisible(ureq.getUserSession().getRoles().isAdministrator());
 		}
 		
 		if (LearningPathNodeAccessProvider.TYPE.equals(courseConfig.getNodeAccessType().getType())) {