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

Localization authors:
- siam <iwata@mxq.mesh.ne.jp>
- Hello <53612225+a2y4@users.noreply.github.com>
- marsf <chimantaea_mirabilis@yahoo.co.jp>
- aefgh39622@gmail.com <aefgh39622@gmail.com>

mozilla/addons-server,mozilla/olympia,mozilla/olympia,mozilla/addons-server,eviljeff/olympia,eviljeff/olympia,wagnerand/addons-server,bqbn/addons-server,mozilla/olympia,eviljeff/olympia,mozilla/addons-server,wagnerand/addons-server,mozilla/olympia,diox/olympia,wagnerand/addons-server,diox/olympia,wagnerand/addons-server,diox/olympia,bqbn/addons-server,bqbn/addons-server,mozilla/addons-server,diox/olympia,bqbn/addons-server,eviljeff/olympia