Bug 20994: Fix capitaization "Save to Lists"

Bug 20994: Fix capitaization "Save to Lists"

On the OPAC result list, below each result, there is a link:
"Save to Lists".

Patch changes this to "Save to lists" following our
capitalization rules.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit d5296743a4b4e6e6004bdb68926a3584e55435e4)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>