I think it's just standard isekai buff, otherwise she wouldn't understand any 2 languages without previous knowledge afterall (there aren't many bilingual people around the globe)
She mentioned that she was able to understand/speak/read/write any language after getting reincarnated. It was a major factor in why the "Gramps" high priest wanted her as a apprentice; she was able to fully interpret a language only 3 people in the entire world knew.