Your source are a fucking blog by a random, and a propagandist clone of wikipedia.
“Hey nazis are cool, this film from Ufa proves it”
Oh and for the first line, it is perfectly common for expert to not speak the language of a country they study as the concept of translation exist, let alone diplomatic institutions of countries you are studying do those translation themselves lol.
Your source are a fucking blog by a random, and a propagandist clone of wikipedia. “Hey nazis are cool, this film from Ufa proves it”
Oh and for the first line, it is perfectly common for expert to not speak the language of a country they study as the concept of translation exist, let alone diplomatic institutions of countries you are studying do those translation themselves lol.