"I will report this to Her Majesty."
"Oh, did he hear the female general mention something about a "His Majesty" just now? Was it referring to an emperor or something?"
Translator changed the gender too fast in "His Majesty".
It's right because the first term is meant to be ambiguous. The guy mistook the ambiguous term to refer to a male monarch.
I would use the phrase: "I will report this to the Crown" if I were the translator.