How to create internationalization page using vueI18n

[PatrykMaternicki]

Hi I am working(testing) a new tools to create ssg. And one of point for requirements is enable to create internalization page. My configuration it looks like this:

const i18n = createI18n({ legacy: false, locale: navigator.getDefaultLang(), fallbackLocale: 'en', messages, }) as I18n

`const ENABLES_LANGUAGES = ['pl', 'en']

export const useNavigator = () => {
const isAvaibleLangRegex = new RegExp(ENABLES_LANGUAGES.join('|'))

const getDefaultLang = () => {
let savedLang: string | null
let browserLang: string

try {
  savedLang = window.localStorage.getItem('lang')
  browserLang = window.navigator.language.split('-')[0].toLowerCase()
} catch {
  savedLang = null
  browserLang = ''
}
	
if(savedLang) {
  return savedLang
} else {
  return isAvaibleLangRegex.test(browserLang) ? browserLang : 'en'
}

}

const isAllowedLanguage = (lang: string) => {
return isAvaibleLangRegex.test(lang.toLowerCase()) ? lang : getDefaultLang()
}

return {
getDefaultLang,
isAllowedLanguage,
}
}`

Because localStorage, navigator it always undefined (make sense, because build is generate by node.js) . I don't know how to set default Language equal polish language when route is /pl/something and english language when route is /en/something