I updated all instances of “select taxonomy” to “Filter Results” instead using the below jquery (add this to your functions.php):
function my_acf_input_admin_footer() {
?>
<script type="text/javascript">
(function($) {
jQuery(document).ready(function($) {
var strNewString = $('.acf-relationship').html().replace(/\Select taxonomy/g,'Filter Results');
$('.acf-relationship').html(strNewString);
});
})(jQuery);
</script>
<?php
}
add_action('acf/input/admin_footer', 'my_acf_input_admin_footer');