I have never lived in Germany but in the countries where I have lived you don't need model releases for editorial work (newspaper, textbook, evening news, etc). I don't think any company in their right mind in Ireland or England would use a non model released image for an advertising campaign.
There has been much chatter on the internet about privacy laws in Germany. I am not a lawyer and it's been years since I've visited Germany. Here is someone discussing the topic. Up to you whether you trust that source.