no confirmation when cancelling the creation of an article or an event

• on the quickstart as admin

• add a root folder test

• add an article art
• add an event eve
• add a news new
• add an overview ove

• use the cross on each tab and close the above four

Note that closing both an event and an article is done without confirmation, while for an overview there is a message "Document has been modified: [Save][Discard][Cancel]", and for a news there is a message "Document is invalid. Discard changes? [Discard][Cancel]".