Add GitHub Action for JSON translation validation

[Copilot]

JSON Validation GitHub Action Implementation

• Convert to use Bun.sh instead of Node.js
• Use Bun's native Bun.file() API for JSON parsing
• Use Bun's file system APIs
• Update GitHub Actions workflow to use oven-sh/setup-bun@v2
• Revert README.md changes as requested
• Test validation script with Bun

Changes Made:

• ✅ Replaced Node.js with Bun in workflow
• ✅ Updated script to use Bun.file() API for reading JSON files
• ✅ Using ES modules (import/export) instead of CommonJS
• ✅ All validation features remain the same (syntax check, missing/extra keys)
• ✅ README.md reverted to original state

Testing:
Script tested successfully with Bun v1.3.3 and properly detects:

• Missing keys in zh-TW.json (fails validation)
• Extra keys in es.json (warnings only)

Original prompt

I want you to add a GitHub Action that on PR opened, will simply validate the JSON against en.json, for example, check for missing or replaced keys, validate the JSON syntax, etc. Please first make a plan and tell me about that plan.

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[Sayrix]

@copilot Use Bun.sh for the actions and the code. Use Bun's native API. Also revert your changes to the README.md

[github-actions]

❌ Translation Validation Failed

The JSON validation check has failed. Please review the workflow logs for details on missing or extra keys, or JSON syntax errors.

View workflow run

[github-actions]

❌ Translation Validation Failed

The JSON validation check has failed. Please review the workflow logs for details on missing or extra keys, or JSON syntax errors.

View workflow run