Bug 32236: Fix alignment of checkbox "Use default values" for item batch modification

Bug 32236: Fix alignment of checkbox "Use default values" for item batch modification

This moves the label to the right in front of the checkbox.
It also shortens the label by adding an additional longer hint text.

To test:
* Go to cataloguing > item batch modification
* On the first page of the tool, look at the checkbox at the bottom
* Apply the patch
* Verify changes

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>