task: #3582158 Change use of Claro in help text

        $output .= '<dt>' . $this->t('Translating help topics') . '</dt>';

        $output .= '<dd>' . $this->t('The title and body text of help topics provided by contributed modules and themes are translatable using the <a href=":locale_help">Interface Translation module</a>. Topics provided by custom modules and themes are also translatable if they have been viewed at least once in a non-English language, which triggers putting their translatable text into the translation database.', [':locale_help' => $locale_help]) . '</dd>';

        $output .= '<dt>' . $this->t('Configuring help search') . '</dt>';

        $output .= '<dd>' . $this->t('To search help, you will need to install the core Search module, configure a search page, and add a search block to the Help page or another administrative page. (A search page is provided automatically, and if you use the core Claro administrative theme, a help search block is shown on the main Help page.) Then users with search permissions, and permission to view help, will be able to search help. See the <a href=":search_help">Search module help page</a> for more information.', [':search_help' => $search_help]) . '</dd>';

        $output .= '<dd>' . $this->t('To search help, you will need to install the core Search module, configure a search page, and add a search block to the Help page or another administrative page. (A search page is provided automatically, and if you use the core Administrative theme, a help search block is shown on the main Help page.) Then users with search permissions, and permission to view help, will be able to search help. See the <a href=":search_help">Search module help page</a> for more information.', [':search_help' => $search_help]) . '</dd>';

        $output .= '</dl>';

        return ['#markup' => $output];

  <li>{% trans %}Check the indexing status of the Help search page. If it is not fully indexed, see {{ cron_topic }} about how to run Cron until indexing is complete.{% endtrans %}</li>

  <li>{% trans %}In the future, you can click <em>Rebuild search index</em> on this page, or {{ cache_topic }}, in order to force help topic text to be reindexed for searching. This should be done whenever a module, theme, language, or string translation is updated.{% endtrans %}</li>

  <li>{% trans %}In the <em>Manage</em> administrative menu, navigate to <em>Structure</em> &gt; <em>Block layout</em>.{% endtrans %}</li>

  <li>{% trans %}Click the link for your administrative theme (such as the core Claro theme), near the top of the page, and verify that there is already a search block for help located in the Help region. If not, follow the steps in the related topic to place the <em>Search form</em> block in the Help region. When configuring the block, choose <em>Help</em> as the search page, and in the <em>Pages</em> tab under <em>Visibility</em>, enter <em>/admin/help</em> to make the search form only visible on the main <em>Help</em> page.{% endtrans %}</li>

  <li>{% trans %}Click the link for your administrative theme (such as the core Admin theme), near the top of the page, and verify that there is already a search block for help located in the Help region. If not, follow the steps in the related topic to place the <em>Search form</em> block in the Help region. When configuring the block, choose <em>Help</em> as the search page, and in the <em>Pages</em> tab under <em>Visibility</em>, enter <em>/admin/help</em> to make the search form only visible on the main <em>Help</em> page.{% endtrans %}</li>

  <li>{% trans %}In the <em>Manage</em> administrative menu, navigate to <em>{{ help_link }}</em>. Verify that the search block is visible, and try a search.{% endtrans %}</li>

</ol>