This is a tough one. He did not like it when others wrote in languages besides Latin. He considered a dead language better than the "vulgar" languages which would constantly be changing. However, I did read somewhere that he did not write exclusively in Latin. The only other choice would be...
You should know by my avatar what I believe. My sister and best friend were there as well. I have vague recollections of it, but do remember Atlantis as being very beautiful. What I recall the most was when the big rock walls came crashing down in the end. I don't have a clue about Lemuria.