fix: set HTML lang attribute to ja for Japanese site

[rotarymars]

Description

Fixing language on meta info.

Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)
• 📝 Documentation update
• 🎨 Style/UI change
• ♻️ Refactor (no functional changes)
• 🔧 Configuration change

Changes Made

• changed lang from en to ja

Testing

• Tested locally with npm run dev
• Build passes (npm run build)
• Lint passes (npm run lint)

Screenshots (if applicable)

Checklist

• My code follows the project's coding style
• I have performed a self-review of my code
• I have commented my code where necessary
• My changes generate no new warnings
• Any dependent changes have been merged and published

Related Issues

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Project	Deployment	Actions	Updated (UTC)
kss-it-committee-github-io	Ready	Preview, Comment	Mar 8, 2026 2:08pm

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 514c79ad-ae0c-496f-be1b-3d1733a873c6

📥 Commits

Reviewing files that changed from the base of the PR and between 646cf73 and dde9f15.

📒 Files selected for processing (1)

• src/app/layout.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/html-lang-ja

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