[ja] add a note in Japanese Localization README

[Okabe-Junya]

Change List

• add a note in Japanese Localization README
  • カッコの前後にスペースを含めるか否かを議論したのでl10nのREADMEに明記する

ref. https://kubernetes.slack.com/archives/CAG2M83S8/p1715772425079079?thread_ts=1715762463.184719&cid=CAG2M83S8

一応確認ですが、カッコの前後は一律でスペースを含めないということでおけでしょうか？

[Okabe-Junya]

/assign nasa9084

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[Okabe-Junya]

Deploy preview:

• https://deploy-preview-46421--kubernetes-io-main-staging.netlify.app/ja/docs/contribute/localization/

[inductor]

/approve

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[nasa9084]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 9962b30564767421f4fda0c5b1732b27b32f3d16