Bug 18901: [QA Follow-up] Do not translate zzpref either

Bug 18901: [QA Follow-up] Do not translate zzpref either

Adding one backslash makes a difference :)
We need to escape the dot in the regex to exclude a file like zzpref
from translation too. Perfect_regexes++

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit a2c9513b1c3449a34f942d8fa53f8ce1fe374e3f)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit 6896fdc5b31178ad9cde381d2b3b3edb2e8e37f9)
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>