Next.js JSON i18n: Translate and Fill

When to use

Use this Skill when:

• The project is Next.js
• i18n resources are .json files (for example en.json, de.json)
• The user wants to add locales, fill missing translations, or align structure (and optionally remove extra keys)

Not a fit when:

• The dictionary format is not JSON (for example .ts, .yaml, .po)
• The user is translating long-form content (docs/pages) or code comments (use the general translation flow, not the i18n subcommand)