Merge branch 'translation/jp' of github.com:ionic-team/ionic-docs

# Conflicts:
#	docs/api/content.md
#	docs/api/picker.md
#	docs/api/title.md
#	docs/developing/config.md
#	docs/updating/8-0.md
#	static/code/stackblitz/v7/angular/package.json
#	static/code/stackblitz/v7/react/package-lock.json
#	static/code/stackblitz/v7/vue/package-lock.json
#	static/code/stackblitz/v8/angular/package.json
#	static/code/stackblitz/v8/html/package.json
#	static/code/stackblitz/v8/react/package-lock.json
#	static/code/stackblitz/v8/react/package.json
#	static/code/stackblitz/v8/vue/package-lock.json
#	static/code/stackblitz/v8/vue/package.json

Author: rdlabo