<div id="slides">
    <div class="slides-container">
        <?php
        global $sitepress;
        $current_language = $sitepress->get_current_language();
        $default_language = $sitepress->get_default_language();
        $sitepress->switch_lang($default_language);
        $images = get_field('slider_images');
        $sitepress->switch_lang($current_language);
        //var_dump($images);
        if( $images ) { ?>

            <?php foreach( $images as $image ): ?>
                    <img
                        src="<?php echo $image['url']; ?>",
                        data-big="<?php echo $image['url']; ?>"
                        data-title="<?php echo $image['alt']; ?>"
                        data-description="<?php echo $image['caption']; ?>"
                    >
            <?php endforeach; ?>
        <?php } else { ?>
        <img src="<?php echo PT_URL; ?>images/slide_1.jpg">
        <img src="<?php echo PT_URL; ?>images/slide_2.jpg">
        <img src="<?php echo PT_URL; ?>images/slide_3.jpg">
        <img src="<?php echo PT_URL; ?>images/slide_4.jpg">
        <?php } ?>

    </div>
</div>