Bug 19233: (follow-up) Send itemnumbers in report results to batch modification

Bug 19233: (follow-up) Send itemnumbers in report results to batch modification

This patch changes the obscure "^" symbol to a styled link with the text
"Batch modify." I think the only disadvantage of this is that it takes
up more space, but it is outweighed by the improved clarity.

This patch also makes minor indentation corrections to new lines of
HTML.

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>