Pontoon: Update Japanese (ja) localization of Thimble
Pontoon: Update Japanese (ja) localization of Thimble

Localization authors:
- Kohei Yoshino <kohei.yoshino@gmail.com>

humphd/thimble.mozilla.org,mozilla/thimble.mozilla.org,humphd/thimble.mozilla.org,mozilla/thimble.mozilla.org,humphd/thimble.mozilla.org,mozilla/thimble.mozilla.org,humphd/thimble.mozilla.org,mozilla/thimble.mozilla.org