Step48_rus,
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
</style>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<script>
$(function(){
var act = $("li.active");
var prev = act.prev();
var next = act.next();
prev.length && prev.find("a").clone().prepend('<span class="fa fa-angle-left fa-lg"></span>').addClass("hpage__footer-link").appendTo(".footer")
next.length && next.find("a").clone().append('<span class="fa fa-angle-right fa-lg"></span>').addClass("hpage__footer-link").appendTo(".footer")
})
</script>
</head>
<body>
<ul>
<li ><a href="">1</a></li>
<li class="active"><a href="">2</a></li>
<li><a href="">3</a></li>
<li><a href="">4</a></li>
</ul>
<div class="footer"></div>
</body>
</html>