Index: skins/Vector.php
===================================================================
--- skins/Vector.php	(revision 82013)
+++ skins/Vector.php	(working copy)
@@ -350,7 +350,7 @@
 	<div class="menu">
 		<ul<?php $this->html('userlangattributes') ?>>
 			<?php foreach ( $this->data['variant_urls'] as $link ): ?>
-				<li<?php echo $link['attributes'] ?>><a href="<?php echo htmlspecialchars( $link['href'] ) ?>" <?php echo $link['key'] ?>><?php echo htmlspecialchars( $link['text'] ) ?></a></li>
+				<li<?php echo $link['attributes'] ?>><a href="<?php echo htmlspecialchars( $link['href'] ) ?>" hreflang="<?php echo htmlspecialchars( $link['hreflang'] ) ?>" link=<?php echo htmlspecialchars( $link['lang'] ) ?>" <?php echo $link['key'] ?>><?php echo htmlspecialchars( $link['text'] ) ?></a></li>
 			<?php endforeach; ?>
 		</ul>
 	</div>
Index: includes/SkinTemplate.php
===================================================================
--- includes/SkinTemplate.php	(revision 82013)
+++ includes/SkinTemplate.php	(working copy)
@@ -1032,7 +1032,9 @@
 				$content_navigation['variants'][] = array(
 					'class' => ( $code == $preferred ) ? 'selected' : false,
 					'text' => $varname,
-					'href' => $title->getLocalURL( '', $code )
+					'href' => $title->getLocalURL( '', $code ),
+					'hreflang' => $code,
+					'lang' => $code,
 				);
 			}
 		}