Add notice to system info

[MAILPOET-949]

assets/js/src/help/system_info.jsx

@@ -13,7 +13,11 @@ function KnowledgeBase() {
 
       <Tabs tab="systemInfo" />
 
-      <div>asdfasdf</div>
+      <div className="mailpoet_notice notice inline notice-success" style={{marginTop: "1em"}}>
+        <p>{MailPoet.I18n.t('systemInfoIntro')}</p>
+      </div>
+
+      <textarea readOnly={true}></textarea>
     </div>
   );
 };

views/help.html

@@ -15,6 +15,7 @@
   'tabSystemInfoTitle': __('System Info'),
   'knowledgeBaseIntro': __('Click on one of these categories below to find more information'),
   'knowledgeBaseButton': __('Visit our Knowledge Base for more articles'),
+  'systemInfoIntro': __('The information below is useful when you need to get in touch with our support. Just copy all the text below and paste it on a message to us'),
 }) %>
 <% endblock %>