Oh, I see. No, Low-German is not a recognised minority language. It is an academic debate if it is best referred to as language or a dialect. I personally don't think there is much to be learned from that debate. In the Middle Ages, when Low-German was the lingua franca of the North and Baltic Sea areas, there was probably useful to regard it as a separate language. Today there is not much reason in doing so. The question isn't too interesting today.