Add missing addOverlay

* wegas-editor-form 
* wegas-editor-entityaction
Some text message...

* Delete confirmation message for variable now contains the variable name
* FSMDescriptor: EDITORNAME = State Machine
* DialogueDescriptor: EDITORNAME = Dialog
Add missing addOverlay

* wegas-editor-entityaction
Some text message...

* FSMInstance: EDITORNAME = State Machine