Bug 15815: Reword confirm message when removing patrons from card batch

Bug 15815: Reword confirm message when removing patrons from card batch

This patch rewords the confirm message when removing patrons from a card
batch.
From: "Are you sure you want to remove card number(s):1 from this
batch?"
To: "Are you sure you want to remove the selected patron(s) from this
batch?"

To test:
1) Go to Tools -> Patron Card Creator -> Manage batches
2) Edit a batch
3) Select one or more patrons and click 'Remove selected patrons' (not
individual Delete buttons)
4) Confirm the message is worded better and easier to understand
5) Click OK and confirm the patrons are deleted as expected

Sponsored-by: Catalyst IT
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>