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

Localization authors:
- kudo <kudo@mozilla-japan.org>
- dskmori <ghoti.fish.dsk@gmail.com>

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