Bug 11642: (follow-up) Improve Batch patron deletion and anonymization GUI to make...

Bug 11642: (follow-up) Improve Batch patron deletion and anonymization GUI to make consequences clearer

This patch makes some template changes to try to make this interface
more consistent with other areas of Koha and to make warnings more
clear.

I have also changed the phrase "deletion/anonymization" to "deletion and
anonymization."

To test, apply the patch and test the patron deletion and anonymization
process and confirm that the interface is clear and works well.

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 7e29b5775f4c378e93f5a4b06f90b50f14a6c1e1)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>