Internationalization and Localization — Review Skill

The i18n review lens for web UI: how user-facing text is authored so it can be translated, how values are formatted per locale, how right-to-left and bidirectional text are handled, and how the locale is chosen and the catalog delivered. Framework-neutral — the rules hold for any i18n library; examples use ICU MessageFormat and the Intl API.

Builds on. react / angular / vue for the i18n library that implements these rules (FormatJS, @angular/localize, vue-i18n), accessibility for the lang and dir semantics and screen-reader language switching, and styling-and-design-tokens for the logical CSS properties that make a layout work in RTL. On a conflict, this skill sets the i18n requirement, the framework skill picks the API, accessibility owns the lang semantics, and styling-and-design-tokens owns the CSS mechanism. Load a sibling only when the task turns on its layer; if it is not loaded, apply that layer from general knowledge and do not block.

This SKILL.md is self-sufficient: the Ruleset below is the complete, enforceable list. Each references/<topic>.md holds that group's reasoning and ❌ / ✅ code, and references/worked-example.md a full review pass; open them for depth when your runtime allows.