Fix Repository quality CI failure by syncing locale settings schemas

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Pull Request Template

Description

This PR addresses the failing Repository quality GitHub Actions job by resolving i18n:check schema drift in locale settings.json files.

• Root cause
  • Non-English locale settings.json files diverged from en/settings.json (missing newly added keys, retaining deprecated keys).
• Change made
  • Synchronized key structure for affected locales: es, fr, it, ko, nl, pt-BR, ru, zh-CN, zh-TW.
  • Removed obsolete caption keys and added new effects.*, effects.cursorClickEffects.*, and captions.editor.* paths where missing.
• Implementation pattern
  • Existing localized values were preserved when present.
  • Missing values were backfilled with English fallback strings to restore structural parity.

"captions": {
	"editor": {
		"text": "Text",
		"start": "Start",
		"end": "End",
		"split": "Split",
		"merge": "Merge",
		"delete": "Delete"
	}
}

Motivation

i18n:check enforces strict key parity between each locale namespace and en. Structural drift caused CI to fail; this change restores parity so the quality gate can pass consistently.

Type of Change

• New Feature
• Bug Fix
• Refactor / Code Cleanup
• Documentation Update
• Other (please specify)

Related Issue(s)

Repository quality workflow failure (job ID: 91104558202).

Screenshots / Video

N/A (no UI behavior change).

Screenshot (if applicable):

![Screenshot Description](path/to/screenshot.png)

Video (wherever possible):

<video src="path/to/video.mp4" controls width="600"></video>

Testing Guide

Run the quality check that was failing:

npm run i18n:check

Expected: i18n-check: locale files are structurally consistent.

Checklist

• I have performed a self-review of my code.
• I have added any necessary screenshots or videos.
• I have linked related issue(s) and updated the changelog if applicable.

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