Bug 10678 - Update addbooks help page

Bug 10678 - Update addbooks help page

The button's name changed, and a caret was added.

Sponsored-by: Universidad Nacional de Cordoba
Signed-off-by: Melia Meggs <melia@bywatersolutions.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Passes all tests and QA script.
If you click the button directly, the default framework is still used.
If you use the split button functionality to select another framework,
this framework will be used for the imported record.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>