Add message about translation being incomplete

content/_index.en.md

 +++
+[extra.hero.message]
+class = "warning"
+title = "Translation is incomplete"
+content = "Please be aware that this translation of our website is incomplete. For any questions and for cooperations, please contact us."
+
 [[extra.claims]]
 title = "Challenging technology"
 content = "How devices and apps work, what they do and which intentions developers pursue: Everyone shall be able to critically scrutinise all of that – and everyone shall have the rights to do so!"

templates/frontpage/claim.html

@@ -5,6 +5,16 @@
 >
   <div class="hero-body">
     <div class="container">
+      {% if section.extra.hero.message %}
+       <aside class="message is-{{ section.extra.hero.message.class }} section">
+        <div class="message-header">
+         <p>{{ section.extra.hero.message.title }}</p>
+        </div>
+        <div class="message-body">
+         {{ section.extra.hero.message.content }}
+        </div>
+       </aside>
+      {% endif %}
       <p class="title is-1 has-text-centered" property="schema:slogan">{{ config.description }}</p>
       <div class="columns is-same-height mt-4">
         {% for claim in section.extra.claims %}