chore: import translations for ja

[wackerow]

Description

Thank you to everyone contributing to translate ethereum.org ❤️

Content buckets imported

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28

[netlify]

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[wackerow]

Still errors on:

        /[...slug]: /ja/roadmap/merge
        /[...slug]: /ja/staking/solo
        /[...slug]: /ja/terms-of-use
        /[...slug]: /ja/web3
        /[...slug]: /ja/whitepaper
        /[...slug]: /ja/wrapped-eth