in assets/js/slick.js [438:480]
    Slick.prototype.buildArrows = function() {
        var _ = this;
        if (_.options.arrows === true ) {
            _.$prevArrow = $(_.options.prevArrow).addClass('slick-arrow');
            _.$nextArrow = $(_.options.nextArrow).addClass('slick-arrow');
            if( _.slideCount > _.options.slidesToShow ) {
                _.$prevArrow.removeClass('slick-hidden').removeAttr('aria-hidden tabindex');
                _.$nextArrow.removeClass('slick-hidden').removeAttr('aria-hidden tabindex');
                if (_.htmlExpr.test(_.options.prevArrow)) {
                    _.$prevArrow.prependTo(_.options.appendArrows);
                }
                if (_.htmlExpr.test(_.options.nextArrow)) {
                    _.$nextArrow.appendTo(_.options.appendArrows);
                }
                if (_.options.infinite !== true) {
                    _.$prevArrow
                        .addClass('slick-disabled')
                        .attr('aria-disabled', 'true');
                }
            } else {
                _.$prevArrow.add( _.$nextArrow )
                    .addClass('slick-hidden')
                    .attr({
                        'aria-disabled': 'true',
                        'tabindex': '-1'
                    });
            }
        }
    };