Merge branch 'translation/jp'

# Conflicts:
#	docs/api/datetime.md
#	docs/api/menu.md
#	docs/api/select.md
#	scripts/data/translated-api.json
#	scripts/data/translated-cache.json
#	scripts/data/translated-cli.json
#	src/components/global/Playground/index.tsx
#	src/translate/.detection/api/checkbox.json
#	src/translate/.detection/api/radio.json
#	src/translate/.detection/api/range.json
#	src/translate/.detection/api/router-outlet.json
#	src/translate/.detection/api/toggle.json
#	src/translate/api/checkbox.json
#	src/translate/api/radio.json
#	src/translate/api/range.json
#	src/translate/api/router-outlet.json
#	src/translate/api/toggle.json
#	static/usage/v7/alert/buttons/vue.md
#	static/usage/v7/theming/automatic-dark-mode/javascript.md
#	static/usage/v7/theming/manual-dark-mode/javascript.md