[FIX] l10n_de: add missing translations

Add missing translations to .pot

opw-3198115

closes odoo/odoo#113854

X-original-commit: 7bba9c99
Signed-off-by: Brice Bartoletti (bib) <bib@odoo.com>
Signed-off-by: Guillaume Vanleynseele (guva) <guva@odoo.com>