Update text how to make a PR when a translation needs a review (#45)

Author: Nyholm

templates/startpage.html.twig

@@ -87,7 +87,15 @@
             {% endfor %}
         </ul>
 
-        <p>Here is an example of the validators.sv.xlf file:</p>
+        <p>
+            A translation could be missing, or it may need a review. Translations
+            marked with <b>state="needs-review-translation"</b> need to be
+            verified by a native speaker (they are translated by a bot). Please
+            very them and remove the state attribute.
+        </p>
+
+        <p>If the translations is missing, you must add it. Here is an example of
+            the validators.sv.xlf file:</p>
 
         <pre><code>
     &lt;trans-unit id="91"&gt;