Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/locale/templates/locale-translation-last-check.html.twig

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+{#
+/**
+ * @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>

core/modules/locale/templates/locale-translation-update-info.html.twig

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+{#
+/**
+ * @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="locale-translation-update__wrapper" tabindex="0" role="button">
+  <span class="locale-translation-update__prefix visually-hidden">Show description</span>
+  {% if modules %}
+    {% set module_list = modules|safe_join(', ') %}
+    <span class="locale-translation-update__message">{% trans %}Updates for: {{ module_list }}{% endtrans %}</span>
+  {% elseif missing_updates_status %}
+    <span class="locale-translation-update__message">{{ missing_updates_status }}</span>
+  {% endif %}
+  {% if details %}
+    <div class="locale-translation-update__details">{{ details }}</div>
+  {% endif %}
+</div>