Tools

Sets up and audits i18n for React, Next.js and Vue apps: replaces hard-coded strings with message keys, checks that English and Chinese keys are complete and consistent, and verifies plurals and date and number formats, with a key audit script. Needs a local codebase and Python.

i18next's official CLI: finds hard-coded strings in JS/TS code, extracts translation keys, checks which locales are missing entries and syncs locale files; init --yes sets up non-interactively, and a bundled agent skill guides app internationalization. Needs a Node.js project using i18next.

Locize's official CLI: sync local translation files with the Locize platform, add, remove and look up keys, download published translations, manage versions and branches, and export JSON, XLIFF, PO, CSV or Excel for translators. Needs a Locize account, project ID and API key; free plan available.

Locize's official plugin: agents translate and review strings using your project's glossary, style guide and translation memory, and check new copy for banned terms; also bundles the Locize MCP and an i18next skill for developers. Needs a Locize account (free tier); browser auth or a personal token.