Old Nose refers to the North Germanic language, which was predominately spoken by those who stayed and lived in the northern part of Germany, which was their homeland. New Swedish and Old Danish are also found in the Northeastern Germany. New Swedish is the official language of Sweden, and is also spoken in Finland, where as Old Danish is spoken in the country of Denmark. Even our very own language of English derived from Germany. The English language also has ties with the language of Frisian.
Spelling becomes important when looking at the language of Germany.
Just looking at the different spelling of words such as bleiben in the north and blieben in the south, tells one about where the individual is from. I can not explain why. That is yet another unsolved mystery of the Germanic language. My guess it has to do with the dialect and change in lifestyle from one side of the country to the other. I have only selected a few of the many languages derived from the language of Germany.