<script>
    (function($) {
        $(document).ready(function() {
            $("#menu_full_custom .et_pb_row").prepend('<a href="your Homepage url"><img src="your logo image url" class="full_menu_logo"></a>');
            var lang = $('html').attr('lang'),
                languageLink = $('#et-languageswitcher a'),
                languageImage = $('#et-languageswitcher a img');
            if (lang == 'ru-RU') {
                languageLink.attr('href', 'http://www.medexpert.sg/en/');
                languageImage.attr('src', 'http://www.medexpert.sg/wp-content/uploads/Anushka/image/LOGO/Britishflag-e1527464550332.png');
            }
            if (lang == 'en-US') {
                languageLink.attr('href', 'http://www.medexpert.sg/ru/');
                languageImage.attr('src', 'http://www.medexpert.sg/wp-content/uploads/Anushka/image/LOGO/Russianflag-e1527464434260.png');
            }
        });
    })(jQuery);
</script>