i18n-localization

The i18n-localization skill provides guidance and implementation patterns for internationalization (i18n) and localization (L10n) in software applications. It helps developers build applications that can support multiple languages, regions, and text directions while avoiding common localization pitfalls. The skill focuses on making applications translatable, organizing locale resources, handling language-specific formatting, and preparing interfaces for both left-to-right and right-to-left languages.

Key capabilities include identifying and preventing hardcoded user-facing strings, managing translation keys and locale file structures, implementing localization in React, Next.js, and Python applications, and supporting locale-aware formatting for dates and numbers. The skill also covers translation organization through namespaces, pluralization support, fallback language strategies, RTL layout considerations, and the use of ICU message formatting for complex translations. In addition, it provides recommended project structures, implementation examples, common issue resolutions, validation checklists, and a script for detecting hardcoded strings and missing translations.

This skill is intended for developers, engineering teams, and application maintainers building public web applications, SaaS platforms, or other products that may require multilingual support. It is useful during application development, localization planning, code reviews, and release preparation. Teams can use it to improve translation readiness, maintain consistent localization practices, and ensure user interfaces remain functional and accessible across different languages and regions.