Bug 16382: Update German web installer sample files for 16.05

Bug 16382: Update German web installer sample files for 16.05

Easy this time, only sample notices have been changed:
- Changed discharge to match the English sample notice.
- Translated new PASSWORD_RESET e-mail

To test:
- Start with an empty database
- Install de-DE
- Run the web installer in de-DE/German
- Verify all files, especially sample notices, load
  without any problems.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Tested removing all from letter table and loading file.
File loads Ok, notices look good.
No errors

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>