[NSFW] Default language cannot be changed

I need to translate english to swedish and set as default language

you guys sent me this code to put it in footer.php

<script type="text/javascript">
?setTimeout(function(){
?if(localStorage.getItem("ChangeLanguageFirstTime") === null) {
? doGTranslate('en|sv');
? localStorage.setItem("ChangeLanguageFirstTime", true);
?}
? }, 3000);
?</script>

but it didnt works

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