Bug 16687 - Translatability: Fix issues in Administration preferences

Bug 16687 - Translatability: Fix issues in Administration preferences

This patch fixes sentence splitting and other translation issues in
file koha-tmpl/intranet-tmpl/prog/en/modules/admin/preferences/admin.pref
to avoid odd translations.

To test:
- Without patch, open Home > Administration > System preferences
  and go to tab 'Administration"
- Apply patch
- Open the same page in a new window and compare the text:
  - Verify  that no sentences are splitted
  - Verify that the text changes do not introduce misunderstandings
    and have the same meaning as without patch

Amended for comment #7 2016-07-12/mv

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Rebased to apply on master and re-inserted test (see comment #14) -2016-09-28/mv
Signed-off-by: Michael Kuhn <mik@adminkuhn.ch>
Signed-off-by: Katrin Fischer  <katrin.fischer@bsz-bw.de>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit a5b64708601f58fddf89d328d7f0ed94cfc214f9)
Signed-off-by: Frédéric Demians <f.demians@tamil.fr>