Around the years 1915-1916 there were plans for a constructed/planned German language called Weltdeutsch.
In the same years Oswald Salzmann created das "vereinfachte Deutsch" on the basis of standard German.
Also in 1915 Adalbert Baumann proposed a solution for the world language problem and named it Wede. Baumann was convinced that a universal auxiliary language was necessary. He critisized the previous solution attempts like Esperanto and suggested developing an artificial language based on a modern language (German or English).
The goal of these planned languages was to spread German language in the world, or at least in the German sphere of influence, especially in the colonies. The theoretical concepts never went realized though.