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

Localization authors:
- whitecatkittyangel <whitecatkittyangel@gmail.com>
- Aokashi.Towa <Aokashi.Towa@Gmail.com>
- marsf <chimantaea_mirabilis@yahoo.co.jp>

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