Thread: I need to change the word Filter to "filtrar" (at the filter bar)

I need to change the word Filter to "filtrar" (at the filter bar)

I tryed it by changing the value in this code from "filter" to "filtrar" (it works but the filter proces wont work, it just wont filter anything):
<p>
<input type="submit" value="filter" name="action" class="submit" />
<?php
// hidden fields for search
if (isset($_GET['s'])) {
echo '<input type="hidden" name="s" value="'.$_GET['s'].'" />';

What can I do?