diff --git a/core/modules/locale/locale.admin.js b/core/modules/locale/locale.admin.js
index 1afad13..69236e7 100644
--- a/core/modules/locale/locale.admin.js
+++ b/core/modules/locale/locale.admin.js
@@ -60,7 +60,7 @@
           $tr.toggleClass('expanded');
 
           // Change screen reader text.
-          $tr.find('.update-description-prefix').text(function () {
+          $tr.find('.js-update-description-prefix').text(function () {
             if ($tr.hasClass('expanded')) {
               return Drupal.t('Hide description');
             }
diff --git a/core/modules/locale/templates/locale-translation-last-check.html.twig b/core/modules/locale/templates/locale-translation-last-check.html.twig
index a54574b..16da566 100644
--- a/core/modules/locale/templates/locale-translation-last-check.html.twig
+++ b/core/modules/locale/templates/locale-translation-last-check.html.twig
@@ -14,12 +14,12 @@
  * @ingroup themeable
  */
 #}
-<div class="locale checked">
+<div>
   <p>
   {% if last_checked %}
     {% trans %} Last checked: {{ time }} ago {% endtrans %}
   {% else %}
     {{ 'Last checked: never'|t }}
   {% endif %}
-  <span class="check-manually">({{ link }})</span></p>
+  <span>({{ link }})</span></p>
 </div>
diff --git a/core/modules/locale/templates/locale-translation-update-info.html.twig b/core/modules/locale/templates/locale-translation-update-info.html.twig
index 15cb4ce..42f5508 100644
--- a/core/modules/locale/templates/locale-translation-update-info.html.twig
+++ b/core/modules/locale/templates/locale-translation-update-info.html.twig
@@ -18,15 +18,15 @@
  * @ingroup themeable
  */
 #}
-<div class="inner" tabindex="0" role="button">
-  <span class="update-description-prefix visually-hidden">Show description</span>
+<div tabindex="0" role="button">
+  <span class="js-update-description-prefix">Show description</span>
   {% if modules %}
     {% set module_list = modules|safe_join(', ') %}
-    <span class="text">{% trans %}Updates for: {{ module_list }}{% endtrans %}</span>
+    <span>{% trans %}Updates for: {{ module_list }}{% endtrans %}</span>
   {% elseif missing_updates_status %}
-    <span class="text">{{ missing_updates_status }}</span>
+    <span>{{ missing_updates_status }}</span>
   {% endif %}
   {% if details %}
-    <div class="details">{{ details }}</div>
+    <div>{{ details }}</div>
   {% endif %}
 </div>
diff --git a/core/themes/classy/templates/locale-translation-last-check.html.twig b/core/themes/classy/templates/locale-translation-last-check.html.twig
new file mode 100644
index 0000000..a54574b
--- /dev/null
+++ b/core/themes/classy/templates/locale-translation-last-check.html.twig
@@ -0,0 +1,25 @@
+{#
+/**
+ * @file
+ * Default theme implementation for the last time we checked for update data.
+ *
+ * Available variables:
+ * - last_checked: Whether or not locale updates have been checked before.
+ * - time: The formatted time ago when the site last checked for available
+ *   updates.
+ * - link: A link to manually check available updates.
+ *
+ * @see template_preprocess_locale_translation_last_check()
+ *
+ * @ingroup themeable
+ */
+#}
+<div class="locale checked">
+  <p>
+  {% if last_checked %}
+    {% trans %} Last checked: {{ time }} ago {% endtrans %}
+  {% else %}
+    {{ 'Last checked: never'|t }}
+  {% endif %}
+  <span class="check-manually">({{ link }})</span></p>
+</div>
diff --git a/core/themes/classy/templates/locale-translation-update-info.html.twig b/core/themes/classy/templates/locale-translation-update-info.html.twig
new file mode 100644
index 0000000..82d58ab
--- /dev/null
+++ b/core/themes/classy/templates/locale-translation-update-info.html.twig
@@ -0,0 +1,32 @@
+{#
+/**
+ * @file
+ * Default theme implementation for displaying translation status information.
+ *
+ * Displays translation status information per language.
+ *
+ * Available variables:
+ * - modules: A list of names of modules that have available translation
+ *   updates.
+ * - details: Rendered list of the translation details.
+ * - missing_updates_status: If there are any modules that are missing
+ *   translation updates, this variable will contain text indicating how many
+ *   modules are missing translations.
+ *
+ * @see template_preprocess_locale_translation_update_info()
+ *
+ * @ingroup themeable
+ */
+#}
+<div class="inner" tabindex="0" role="button">
+  <span class="js-update-description-prefix visually-hidden">Show description</span>
+  {% if modules %}
+    {% set module_list = modules|safe_join(', ') %}
+    <span class="text">{% trans %}Updates for: {{ module_list }}{% endtrans %}</span>
+  {% elseif missing_updates_status %}
+    <span class="text">{{ missing_updates_status }}</span>
+  {% endif %}
+  {% if details %}
+    <div class="details">{{ details }}</div>
+  {% endif %}
+</div>