Update Japanese locale.js

[manabuishii]

(Please replace this header with a description of your pull request. Please include BOTH what you did and why you made the changes. The "why" may simply be citing a relevant Galaxy issue.)
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I update Japanese translation.

How to test the changes?

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• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
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  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

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[bgruening]

Thanks @manabuishii!

You can use make client-format to eliminate the linting error.

[jdavcs]

@manabuishii please fix linting (as per comment above), and I'll be happy to merge this.

[github-actions]

This PR was merged without a "kind/" label, please correct.