l10n: de.po: fix translation of "head nodes"
l10n: de.po: fix translation of "head nodes"

Signed-off-by: Ralf Thielow <d790fea1760bfa57e221e3da971e544c5c4e0598@gmail.com>
Acked-by: Phillip Sz <ed0b7c2466d14fc974b3bab7d6754a20c8a39ae5@gmail.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git