Site is not translate first after document.cookie = ‘googtrans=/en/ar’;

I want to translate my whole site in Arabic directly. for this purpose i add following code in my footer.php file.

<script>
if(localStorage.getItem("ChangeLanguageFirstTime") === null) {
    document.cookie = 'googtrans=/en/ar';
    localStorage.setItem("ChangeLanguageFirstTime", true);
}
</script>

but above code translate my site too late. First my site load in English the auto translate in Arabic after sometime.

I want to open my site directly in Arabic

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