AddThis

How to change the AddThis default language?

Hi there, i've changed the ui_language but the alt still is in english.

This is my code:

<!-- AddThis Button BEGIN -->
<div class="addthis_toolbox addthis_default_style ">
<div class="labelsPartilhar">Partilhar</div>
<a class="addthis_button_preferred_1"></a>
<a class="addthis_button_preferred_2"></a>
<a class="addthis_button_preferred_3"></a>
<a class="addthis_button_preferred_4"></a>
<a class="addthis_button_compact"></a>
<a class="addthis_counter addthis_bubble_style"></a>
</div>
<script type="text/javascript">
var addthis_config = {
"data_track_addressbar":true,
"ui_language":"pt"
};
</script>
<script type="text/javascript" src="http://s7.addthis.com/js/250/addthis_widget.js#pubid=ra-5017edc23234a60b"></script>
<!-- AddThis Button END -->

Why is not working?