wordpress/php-fpm/wordpress_files/themes/sustrai-twentytwelve/functions.php

<?php
/*  Overwrite polylang default query that just query posts in current language. 
//  We also show just a language, but we include post in other language without traslation to current.
//  at index.php and other templates.
*/  
//add_filter('parse_query', 'show_mixed_languages');
//function show_mixed_languages($query) {
//		$query->set( 'lang', '' );
//    $query->set( 'cat', '-29, -94' );
//}


// DEBUG QUERY
//add_filter( 'posts_request', 'dump_request' );
//
//function dump_request( $input ) {
//	var_dump($input);
//	return $input;
//}



// MIXED LANGUAGES STRATEGY
// When in not default language, We show post in that language and 
//the post in default language that do no have translation.


/* Polylang uses the action parse_query which is fired before pre_get_posts so $query->set( 'lang', '' ); can't work. */
//add_filter('pre_get_posts', 'get_default_language_posts', 1);
/*  So parse_query */ 
add_filter('parse_query', 'get_default_language_posts', 1);

function get_default_language_posts($query) {
    if ($query->is_main_query() && function_exists('pll_default_language') && !is_admin()) {
        $terms = get_terms('post_translations'); //polylang stores translated post IDs in a serialized array in the description field of this custom taxonomy
        $defLang = pll_default_language(); //default lanuage of the blog
        $curLang = pll_current_language(); //current selected language requested on the broswer
        //echo ".....".$defLang;
	//echo ".....".$curLang;
        $filterPostIDs = array(); // discarded posts
        foreach ($terms as $translation) { // if there is no translations $terms has no elements, and do not exclude any.
            $transPost = unserialize($translation->description); 
            //if the current language is not the default, lets pick up the default language post
            if ($defLang != $curLang) {
                $filterPostIDs[] = $transPost[$defLang];
	    }
        }
        if ($defLang != $curLang) {
	    /*echo "_";*/
            $query->set( 'lang', '' );
            //$query->set('lang', $curLang . ',' . $defLang);  //select both default and current language post
            $query->set('post__not_in', $filterPostIDs); // remove the duplicate post in the default language
        }
    }

   # Discard some cats
   if ( $query->is_main_query() && $query->is_home() ) {
	$query->set( 'cat', '-29, -94' ); // Discard some categories (boletin and boletina).
   }
}



if ( ! function_exists( 'twentytwelve_entry_meta' ) ) :
/**
 * Set up post entry meta.
 * Prints HTML with meta information for current post: categories, tags, permalink, author, and date.
 * Create your own twentytwelve_entry_meta() to override in a child theme.
 * @since Twenty Twelve 1.0
 */
function twentytwelve_entry_meta($ID) {
	// Translators: used between list items, there is a space after the comma.
	$categories_list = '<span class="post-cats">'.get_the_category_list( __( ', ', 'twentytwelve' ) ).'</span>';

	// Translators: used between list items, there is a space after the comma.
	$tag_list = get_the_tag_list( '', __( ', ', 'twentytwelve' ) );

	$date = sprintf( '<span class="the_date">%1$s</span>', esc_html( get_the_date() )	);

	$author = sprintf( '<span class="author vcard">%1$s</span>', get_the_author() )  ;


	$curr_l = pll_current_language();
	if ($curr_l == 'es'): 
		$alt_l = 'eu'; 
	else:
		$alt_l = 'es';
	endif;
  $translations = pll_the_languages( array( 'raw' => 1 , 'post_id' => $ID ) );
  $home_alt = pll_home_url($alt_l);
  $link_alt = $translations[$alt_l]['url'];
  if ($link_alt != $home_alt):
	  $link_translation = sprintf('<a href="%1$s"><span class="langsw-post"><span class="langsw-post">%2$s</span></a>',$link_alt, $alt_l);
	endif;


	// Translators: 1 is category, 2 is tag, 3 is the date and 4 is the author's name.
	if ( $tag_list ) {
		$utility_text = __( 'Ths entry was posted in %1$s and tagged %2$s on %3$s<span class="by-author"> by %4$s</span>.', 'twentytwelve' );
	} elseif ( $categories_list ) {
		$utility_text = __( '%5$s %3$s - %1$s ' , 'twentytwelve' );
	} else {
		$utility_text = __( 'his entry was posted on %3$s<span class="by-author"> by %4$s</span>.', 'twentytwelve' );
	}
	printf(
		$utility_text,
		$categories_list,
		$tag_list,
		$date,
		$author,
		$link_translation
	);

}
endif;

add_filter( 'wp_nav_menu_items','add_search_box', 10, 2 );
function add_search_box( $items, $args ) {
$items .= '<li id="searchli" >' . get_search_form( false ) . '</li>';
return $items;
}