Bug 26881: Remove period on limit to available items on opac

Bug 26881: Remove period on limit to available items on opac

To test:
1- do a search on the opac
2- on the results page, it says "Limit to currently available items."
3- apply patch, restart, reload
4- period is gone

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Barbara Johnson  <barbara.johnson@bedfordtx.gov>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>