[WIP] [ja] Merge dev-ja into main @v4

[Okabe-Junya]

Describe your changes

Merge dev-ja into main to release the Japanese localization v4!!

Terms to be added

• #2968
• #2987
• #2992
• #3017
• #3021
• #3022

The following modifications/updates are included

• #2999
• #3006
• #3025

Related issue number or link (ex: resolves #issue-number)

No issue related to this PR

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• [x] This PR does not contain plagiarism
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• [x] I have signed off on all commits
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[Okabe-Junya]

@naonishijima @kaitoii11 @inductor @yuichi-nakamura @seokho-son @jihoon-seo @iamNoah1 @nate-double-u

We are ready to merge this PR!! Fantastic news, Our Japanese l10n team has translated all the words!! Thank you for all of you!!

Acknowledgements

This PR includes contributions by @t-katsumura @katzchang @shinj05 @bashi8128, thank you!!

[seokho-son]

Thanks!! on be half of the Japanese team, let me approve and merge this PR.