I always send a short English introduction, followed by a computer generated translation into the local language, especially to a business in a rural area of any country. While most people may expect fabricators in Germany will speak English, in certain areas this is often not the case. Berlebach is in an area that was controlled by the Russians, is very close to the Polish and Czech borders so I would expect that English for many may be a third or fourth language.
I have in fact done just that with Berlebach for some tripod parts for my Berlebach tripod around 3-4 years ago. I received a reply in German and completed the transaction online as I knew which part number to order.