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src/boot/i18n.js

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+import { defineBoot } from '#q-app/wrappers'
+import { createI18n } from 'vue-i18n'
+import messages from 'src/i18n'
+
+let i18n = null
+
+export default defineBoot(({ app }) => {
+  const getLocale = () => {
+    const saved = localStorage.getItem('lang')
+    if (saved && messages[saved]) return saved
+    
+    const browserLang = navigator.language
+    if (messages[browserLang]) return browserLang
+    
+    const shortLang = browserLang.split('-')[0]
+    return Object.keys(messages).find(lang => lang.startsWith(shortLang)) || 'en-US'
+  }
+
+  const locale = getLocale()
+  
+  i18n = createI18n({
+    locale,
+    fallbackLocale: 'en-US',
+    legacy: false,
+    messages
+  })
+
+  localStorage.setItem('lang', locale)
+  document.documentElement.lang = locale
+  app.use(i18n)
+})
+
+export const setGlobalLocale = (newLocale) => {
+  if (i18n && i18n.global) {
+    i18n.global.locale.value = newLocale
+    localStorage.setItem('lang', newLocale)
+    document.documentElement.lang = newLocale
+  }
+}