ようこそいらっしゃいました。 (Welcome in Japanese)!
The Google Maps Directions to GPX now has support for all available languages in Google Maps. What this means is that you can get directions and next turn information in other languages than English.
Update #3 is now live but I am still working on providing accurate "next-turn" information for non-English languages. This will be available shortly.
Are you interested in the development of this tool?
Here are the previous posts:
Developer & Programmer with +15 years professional experience building software.
Seeking WFH, remoting or freelance opportunities.