diff --git a/core/lib/Drupal/Core/EventSubscriber/ActiveLinkResponseFilter.php b/core/lib/Drupal/Core/EventSubscriber/ActiveLinkResponseFilter.php
index ea8bff1..1258e28 100644
--- a/core/lib/Drupal/Core/EventSubscriber/ActiveLinkResponseFilter.php
+++ b/core/lib/Drupal/Core/EventSubscriber/ActiveLinkResponseFilter.php
@@ -192,14 +192,17 @@ public static function setLinkActiveClass($html_markup, $current_path, $is_front
       // The query parameters of an active link are equal to the current
       // parameters.
       if ($add_active) {
-        if ($query) {
-          if (!$node->hasAttribute('data-drupal-link-query') || $node->getAttribute('data-drupal-link-query') !== Json::encode($query)) {
-            $add_active = FALSE;
+        // Only remove the "active" class if the element is not of the class "language-link".
+        if (!in_array('language-link', explode(' ', $class))) {
+          if ($query) {
+            if (!$node->hasAttribute('data-drupal-link-query') || $node->getAttribute('data-drupal-link-query') !== Json::encode($query)) {
+              $add_active = FALSE;
+            }
           }
-        }
-        else {
-          if ($node->hasAttribute('data-drupal-link-query')) {
-            $add_active = FALSE;
+          else {
+            if ($node->hasAttribute('data-drupal-link-query')) {
+              $add_active = FALSE;
+            }
           }
         }
       }
diff --git a/core/misc/active-link.js b/core/misc/active-link.js
old mode 100644
new mode 100755
index 9cf55b4..6c65e60
--- a/core/misc/active-link.js
+++ b/core/misc/active-link.js
@@ -53,6 +53,13 @@
       for (var i = 0; i < il; i++) {
         activeLinks[i].classList.add('is-active');
       }
+
+      // Mark language links in the current language as active, no matter the query string.
+      var languageLinks = context.querySelectorAll('.language-link[hreflang="' + path.currentLanguage + '"]');
+      for (var k = 0; k < languageLinks.length; k++) {
+        languageLinks[k].parentNode.classList.add('is-active');
+        languageLinks[k].classList.add('is-active');
+      }
     },
     detach: function (context, settings, trigger) {
       if (trigger === 'unload') {
diff --git a/core/modules/system/system.module b/core/modules/system/system.module
old mode 100644
new mode 100755
index a1a6b71..152299f
--- a/core/modules/system/system.module
+++ b/core/modules/system/system.module
@@ -661,9 +661,7 @@ function system_page_attachments(array &$page) {
   // @see \Drupal\Core\Utility\LinkGenerator::generate()
   // @see template_preprocess_links()
   // @see \Drupal\Core\EventSubscriber\ActiveLinkResponseFilter
-  if (\Drupal::currentUser()->isAuthenticated()) {
-    $page['#attached']['library'][] = 'core/drupal.active-link';
-  }
+  $page['#attached']['library'][] = 'core/drupal.active-link';
 }
 
 /**