IS there anything like the Wundlist extension planned for todoist?
Can I also ask questions in German?
Yes, there are extensions for Firefox and Chrome. You can add websites and Google Mails with them:
You can also ask questions in German as David from the support team speaks German as far as I know.
is there also any extension planned for Safari (Mac)?
At this time there are no plans for a Safari extension. You can use our Todoist Anywhere ability. http://todoist.com/anywhere