Bug 21545: Translate new ACCOUNT_PAYMENT and ACCOUNT_WRITEOFF notices to German

Bug 21545: Translate new ACCOUNT_PAYMENT and ACCOUNT_WRITEOFF notices to German

To test:
- Apply patch
- Run the German web installer
- Verify the sample notices installs without error
- Verify it looks 'German' in the GUI :)

Signed-off-by: Hayley Mapley <hayleymapley@catalyst.net.nz>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit 6b610497ffba5008f4e2541dc6cb07727ac5a63a)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>