<script type="text/javascript">
    jQuery(document).ready(function () {
        jQuery("#menu_full_custom .et_pb_row").prepend('<a href="your Homepage url"><img src="your logo image url" class="full_menu_logo"></a>');
    });

    jQuery('html[lang="ru_RU"] #et-languageswitcher img').attr('src', 'http://www.medexpert.sg/wp-content/uploads/Anushka/image/LOGO/Britishflag-e1527464550332.png')
});

</script>