3 years ago, I started to play WoW in Colorado to reach Japanese community since there is no community in CO and even very small asian population. So I can imagine how fun to communicate/learn English via WoW. (Now I'm in WA and go back to Japan next year.)
Also, I know that moderate number of English speakers are playing WoW in Japan. They often play with Japanese guild to match time zone. This addon must help them.
I'm very glad to hear your comment. This sort of feedback would be a big reason why I develop this addon although I'm already able to use/speak both English and Japanese enough to play.