tweak dialog to have a default button and fix up for current glade behaviour
tweak dialog to have a default button and fix up for current glade behaviour

Change-Id: I23b314890d8842bd368af69fa8bd2bcf71e592dd

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core