The useCookieLocale() composable returns the cookie locale.
If this composable function is called on client-side, it detects the locale from the value of document.cookie via useCookie(). else on the server side, the locale is detected from the value of cookie header.
Note that if the value of detectBrowserLanguage.useCookie is false, an empty string is always returned.
declare function useCookieLocale(): Ref<string>