Bug 20709: (follow-up) Update GERMAN MARC frameworks to Update 26 (April 2018)

Bug 20709: (follow-up) Update GERMAN MARC frameworks to Update 26 (April 2018)

A follow-up in line with bug 20710.

Again, the files used here have been generated automatically
from the po files on translate.koha-community.org.

To test:
- Make sure the de-DE installer can install all mandatory files cleanly.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Tested using de-DE installer, all files load Ok
No errors

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit c058a4a4858d5c03841b88ba65d232a03046304d)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>