Add Japanese translation (#1552)

* add device.ja.yml

* update device.ja.yml

* add file simple_form.ja.yml

* Added doorkeeper.ja.yml

* add ja.yml

* Update doorkeeper.ja.yml

fixed url to uri

* update ja.yml

* fix some translations

* fix japanese grammar of a translate

* fix some translates

* fix ja.yml

* add ja.jsx

* add Japanese user mail views

* Added japanese translate locales

* Added :ja to available_locales

こっちも

* Added "日本語" to HUMAN_LOCALES

* Imported/Added ja to addLocaleData

* update ja.jsx