Build and maintain internationalized interfaces that feel native in every supported locale, not merely translated. Localization is more than swapping strings. It is adapting layout, formatting, content, and interaction patterns so that users in every market experience the product as intentional, not as an afterthought. Consult the language and locale selection reference when designing language selectors, country pickers, currency choosers, or regional-preference controls. Consult the component accessibility reference when localizing custom components that must remain keyboard-navigable and sc…