UTableEntity: improve deletion confirmation message
In Ext implementation record deletion conformation message includes description attribute value and entity caption:
Record [instance descr attr value] will be deleted from the [entity caption]. Are You sure?
UTableEntity should use the same algo. See ext implementation here: https://git-pub.intecracy.com/unitybase/ubjs/blob/master/packages/adminui-pub/_src/app/view/EntityGridPanel.js#L2377