Force default language in Recent Posts Widget

Hello
Please help me to modify Recent post widget to force default language post if translation isn’t available. I’ve got a solution for index.php files etc here. And I’m trying to do the same with my widget code. Please help me to modify the code from widget to show english posts only.
This is widget code fragment to be modified:

echo ( $title )? $before_widget . $before_title . $title . $after_title:$before_widget;

		$num_posts_query = new WP_Query( (( $category ) ? "cat=".$category."&": '')."showposts=".$posts_num."&offset=".$offset );

		if( $num_posts_query->have_posts()) {
		$counter = 0;
		?>
		    <div class="wpalp">
			<ul class="wpalp_thumbnails<?php echo ($thumbnails_only)?' wpalp_thumbonly':''; echo ($thumbnails)?' wpalp_thumbs':'';?>">
<?php			    while( $num_posts_query->have_posts()) : $num_posts_query->the_post();
			    update_post_caches($posts);
				$counter++;
				?>
				<li style="<?php echo ($thumbnails_only)?'float:left;':'clear:both;';?>" <?php echo ($counter < $posts_num)?'class="'.$pb.'"':"";?>>
<?php
if ($thumbnails ) {
	$thumbfound=false;
	$shadow_class="";
	global $post;

	$post_da_thumb = (get_post_meta($post->ID, 'post_thumbnail', true)) ? get_post_meta($post->ID, 'post_thumbnail', true) : get_post_meta($post->ID, 'thumbnail', true);

	if(has_post_thumbnail()) {
			$post_da_thumb=wp_get_attachment_url( get_post_thumbnail_id() );
		}

	$frame_class = ($frame == '' || $frame == false) ? '': ' wpalp_thumb_frame';
	if($frame_class != '')
		$shadow_class = ($shadow == '' || $shadow == false) ? '': ' wpalp_frameshadow';
	// try "Get The Image" plugin
	if ( function_exists('get_the_image') ) {

http://wordpress.org/plugins/polylang/