The only string in the LightBox widget that is localizable is handled using the counterFormat option. The default value is '[i] of [n]', where i and n are built-in parameters for the current page index and the number of pages. You can localize or customize this string using code like the following.

<script type="text/javascript">
  $(document).ready(function () {
    $("#id").wijlightbox({
        counterFormat: '[i]/[n]'
    });
});
</script>