Update messages_ja_JP.properties

[tkymmm]

Description

Please provide a summary of the changes, including relevant motivation and context.

Closes #(issue_number)

Checklist

• I have read the Contribution Guidelines
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have read the section Add New Translation Tags (for new translation tags only)

[github-actions]

🚀 Translation Verification Summary

📋 Checking with the file messages_en_GB.properties from the main-branch - Checking the pr-branch

🗂️ Checking File: messages_ja_JP.properties...

• Test 1 Status: ✅ Passed
• Test 2 Status: ✅ Passed

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✅ Overall Check Status: Success