I am pokayoke. I have done a translation ANN thread, bounty thread and JSON file with Japanese.
Please check below.

Language:Japanese
ANN: https://bitcoingarden.org/forum/index.php?topic=23636.0
Bounty: https://bitcoingarden.org/forum/index.php?topic=24087.msg219657#msg219657Language:
Whitepaper link:NO
JSON link: https://drive.google.com/file/d/1EcaB6KultVuAE4GyKmmw3WKLHHlIO8ih/view?usp=sharing