Naa, no need for panic (yet).
Sure, the domain is down right now, but all this talk about "redemption grace period" basically means: "pay us now and everything goes back to the way it was". So, as I read it: someone, somehow, screwed up the annual payment to Denic that keeps the domain registered. Consequently, it was taken down - but it won't be given to anybody else either right now, so you still have some time to redeem your error and make the payment, if you want to go on using it. And then everything will simply go back to normal. So I expect once the missing payment is made & processed by Denic, huntertalk.de will once again be up and running, like nothing ever happened.
Btw, not the first instance of domain registration trouble for huntertalk.de, I am sure it will come out of it totally unscathed and shiny, as it always did in the past