Improving Polylang plugin for WordPress

/* In include/post-translations.php */

            <td><?php echo esc_html($language->name);?></td>
            <td>
                <?php
                    $this->dropdown_posts( array(
                            'post_type' => get_post_type(),
                            'selected' => intval($value),
                            'select_name' => 'post_tr_lang['.esc_attr($language->slug).']',
                            'exclude' => $post_ID
                        ) );
                ?>
            </td>

/* Here is the dropdown_posts function: */

    function dropdown_posts($args) {
        $defaults = array(
                'depth' => 0,
                'echo' => 0,
                'numberposts' => -1,
                'sortby' => 'post_title',
                'order' => 'ASC'
            );

        $r = wp_parse_args( $args, $defaults );
        $posts = get_posts( $r );
        $options_html = walk_page_dropdown_tree( $posts, 0, $r );

        printf('<select name="%s"><option value="">%s</option>%s</select>',
            $r['select_name'],
            __('None'),
            $options_html);
    }

/* And finaly -- you should check for the surpress_filters to be off when modifying the queries via pre_get_posts: */

    // filters posts according to the language
    function pre_get_posts($query) {
        // Don't run if suppress_filters is on.
        if ( isset( $query->query_vars[ 'suppress_filters' ] ) && $query->query_vars[ 'suppress_filters' ] == true )
            return $query;

        /* [...] */
    }