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* Translate concept / _index.md to Japanese * Update contecpt/_index.md of Japanese * Updata concept/_index of ja according to guideline * Update content/ja/docs/concepts/_index.md Co-Authored-By: inductor <kohei.ota@zozo.com> * Update content/ja/docs/concepts/_index.md Co-Authored-By: inductor <kohei.ota@zozo.com> * Update content/ja/docs/concepts/_index.md Co-Authored-By: inductor <kohei.ota@zozo.com> * Update content/ja/docs/concepts/_index.md Co-Authored-By: inductor <kohei.ota@zozo.com> * Update content/ja/docs/concepts/_index.md Co-Authored-By: inductor <kohei.ota@zozo.com> * Update content/ja/docs/concepts/_index.md Co-Authored-By: inductor <kohei.ota@zozo.com> * Update content/ja/docs/concepts/_index.md Co-Authored-By: inductor <kohei.ota@zozo.com> * Update content/ja/docs/concepts/_index.md Co-Authored-By: inductor <kohei.ota@zozo.com> * Update content/ja/docs/concepts/_index.md Co-Authored-By: inductor <kohei.ota@zozo.com> * Update content/ja/docs/concepts/_index.md Co-Authored-By: inductor <kohei.ota@zozo.com> * Update content/ja/docs/concepts/_index.md Co-Authored-By: inductor <kohei.ota@zozo.com> * Update content/ja/docs/concepts/_index.md Co-Authored-By: inductor <kohei.ota@zozo.com> * Update content/ja/docs/concepts/_index.md