frontend-internationalization

i18n standards for Vue 3 and Nuxt 3 using @nuxtjs/i18n (vue-i18n) — when to add i18n, locale file structure and key naming, message format and pluralisation, lazy-loaded locales, routing strategy and SEO alternates, locale detection and cookie persistence, Intl formatting, RTL and text expansion, translated validation/alt/aria text, lang/dir attributes, testing and translation workflow. Load when adding or changing translations, locales, localized routing, formatting of dates/numbers/currency, or reviewing user-facing strings.