Fix ineffective tests in IntervalsActions and update license header (#4971)

Author: severe77

js/turtleactions/IntervalsActions.js

@@ -472,3 +472,6 @@ function setupIntervalsActions(activity) {
         }
     };
 }
+if (typeof module !== "undefined" && module.exports) {
+    module.exports = { setupIntervalsActions };
+}