[WOOCOMMERCE] Modify navigation search form

functions.php

<?php
/**
 * modify search form
 * 	- "search for products" string translate
 * 	- language for qTranslate
 */
add_action( 'after_setup_theme', 'lgpd_change_search_nav' );
function lgpd_change_search_nav(){
    remove_action('woo_nav_before', 'wootique_header_search');
    add_action('woo_nav_before', 'lgpd_wootique_header_search');
}
function lgpd_wootique_header_search() {
    global $woo_options;
    ?>
    <div id="search-top">

        <form role="search" method="get" id="searchform" class="searchform" action="<?php echo home_url() . "?lang=" . qtrans_getLanguage(); ?>">
            <label class="screen-reader-text" for="s"><?php _e('Search for:', 'woothemes'); ?></label>
            <input type="text" value="<?php the_search_query(); ?>" name="s" id="s"  class="field s" placeholder="<?php _e('Search for products', 'my_text_domain'); ?>" />
            <input type="image" class="submit btn" name="submit" value="<?php _e('Search', 'woothemes'); ?>" src="<?php echo get_template_directory_uri(); ?>/images/ico-search.png">
            <!-- @goliver hidden field for qTranslate -->
            <input type="hidden" name="lang" value="<?php echo qtrans_getLanguage(); ?>">
            <?php if ($woo_options['woo_header_search_scope'] == 'products' ) { echo '<input type="hidden" name="post_type" value="product" />'; } else { echo '<input type="hidden" name="post_type" value="post" />'; } ?>
            </form>
        <div class="fix"></div>

    </div><!-- /.search-top -->
    <?php
}