English -> Japanese translations

EN->JP translations.md

English->Japanese translation contributions I've made over the years:

https://github.com/hymm/squid-tracks/blame/master/src/locales/ja.json

https://github.com/Thricehappy/EveScoutRescue/blob/master/bounce/index_ja.php

https://github.com/GoldenChrysus/ffxiv-ember-overlay/tree/bleeding-edge/src/data/locales (JP)

https://github.com/loadout-ink/splat2-calc/blame/5443a03984c629182a34d7dd5ce46368a0afe31d/locale/ja-jp.js

https://www.signalcartel.com/corp-credo-translations#japanese

JP->EN contributions:

https://www.reddit.com/r/NintendoSwitch/comments/5uqoz1/if_you_just_want_to_clear_the_game_and_see_the/

https://www.reddit.com/r/MonsterHunter/comments/7vyjc9/tip_from_mh_official_jp_wearing_any_mantle_will/

https://www.reddit.com/r/splatoon/comments/6ym3cm/along_with_the_patch_well_adjust_the_settings_for/

https://www.reddit.com/r/splatoon/comments/6q47li/rank_will_be_adjusted_such_that_you_can_rise/

When the Splatoon 2 dev team would post detailed patch notes first in Japanese, I would often live translate these but I can't find any online now. Maybe it was only in a popular Discord server.