fix sitemap

frontend/modules/sitemap/views/default/index.php

@@ -10,16 +10,16 @@
 echo '<?xml version="1.0" encoding="UTF-8"?>' . PHP_EOL;
 ?>
 <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
+        xmlns:xhtml="http://www.w3.org/1999/xhtml"
         xmlns:image="http://www.google.com/schemas/sitemap-image/1.1"
-        xmlns:news="http://www.google.com/schemas/sitemap-news/0.9"
-        xmlns:xhtml="http://www.w3.org/1999/xhtml">
+        xmlns:news="http://www.google.com/schemas/sitemap-news/0.9">
     <?php foreach ($urls as $url): ?>
         <url>
             <loc><?= yii\helpers\Url::to($url['loc'], true) ?></loc>
 
             <?php if($langs) :
                 foreach ($langs as $lang) : ?>
-                    <xhtml:link rel="alternate" hreflang="<?=$lang->url?>" href="<?= yii\helpers\Url::to('/'.$lang->url.'/'.$url['loc'], true) ?>"/>
+                    <xhtml:link rel="alternate" hreflang="<?=$lang->url?>" href="<?= yii\helpers\Url::to('/'.$lang->url.($url['loc']=='/'?'':'/'.$url['loc']), true) ?>"/>
                 <?php endforeach;
             endif; ?>