Bug 18690 - Typos in Koha database description (Table "borrowers")

Bug 18690 - Typos in Koha database description (Table "borrowers")

This string patch fixes typos in kohastructure.sql as described in initial
comment.

To test:
- Carefully verify that string changes make sense

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit 279126d710233f7925432ab1f8fa6ae9f947889e)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit 7ff2fd6e9a3bcd40e22a4f69c5c303fe0f7d1706)
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>