Update de.json

pdated Online transactions, Digital distribution and VPN
Merge pull request #570 from Casimo/patch-1

Update de.json
Update de.json

upwards from i18n-dukgoxmpp-desc to i18n-dns-provider
left links to English guides as they were, with description
Update de.json - fixed some typos
fix conflict and rm Zarafa and Zimbra descriptions
fix de.json conflict