i18n(ja): Revert keywords.md keyword list to English (#22977 follow-up)

[yahonda]

This PR re-applies the fix from #22977 which was overwritten by the automated translation update (commit 6a9f17f).

Changes

Reverts the keyword list in keywords.md from Japanese translations back to English, matching the original #22977 fix.

The SQL keywords themselves (e.g., SELECT, UPDATE, DELETE) are universal identifiers and should remain in English even in Japanese documentation.

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[gemini-code-assist]

Code Review

This pull request updates the keywords.md file by reverting the Japanese translations of SQL keywords back to their standard English uppercase representations (e.g., converting 'アカウント' to 'ACCOUNT') and making minor Japanese phrasing improvements in the introductory text. Feedback was provided to refine a sentence on line 12 to ensure a more natural Japanese structure, avoiding an unnatural trailing colon and backticks.

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