As per the title, the KendoEditor "Change" event doesn't fire when insert link box actually inserts the link.
It gets fired if the focus changes afterward though... even if you click the start button.
You can actually see this in the KendoUI demonstration page: http://demos.telerik.com/kendo-ui/editor/events
The problem with this is if you need to enable a save button so they can save the changes, they have to click somewhere first.