[Plugin: Verve Meta Boxes] Date translation

Hi,
Verve Meta Boxes is a awesome plugin, I am really happy using it.

I’m trying to make the date fields show the information in another language (Spanish). WordPress is configured in that language, the translation across the panel is correct, but the dates do not get it. I have modified the file “inc/utility_MTUtil.php” and “js/date.js” but does not work, the plugin is not reading the days / months there.

My code is:

<?php $my_field = get_post_meta($post->ID, "fecha", $single = true); ?>
<?php echo date("l, j/F",strtotime($my_field));?>

Could you please help me?

Thanks.