I found the answer using this script
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false&libraries=places&language=es">
$(document).ready(function() {
var autocomplete = document.getElementById('ctl00_ContentPlaceHolder2_txtbuscar');
var options = {
//types: ['(cities)'],
componentRestrictions: { country: 'es' }
};
autocomplete = new google.maps.places.Autocomplete(autocomplete, options);
}
)</script>