I want to know the answer to the following question:
What well known socialist adopted the usage of this term in Germany?
All the background I'm provided with is that "There has been a persistent confusion between the several uses of the terms: philanthropic humanists look to what they consider their antecedents in critical thinking and human-centered philosophy among the Greek philosophers and the great figures of Renaissance history; and scholarly humanists stress the linguistic and cultural disciplines needed to understand and interpret these philosophers and artists.". Is that enough to answer the question?
Answer: no