Keep announcements for 100 days by default

Change-Id: Idce630beb3220c46a9b1f16cd8d7cba758f6b18e
diff --git a/templates/en/about.html.ep b/templates/en/about.html.ep
index 8492134..738add6 100644
--- a/templates/en/about.html.ep
+++ b/templates/en/about.html.ep
@@ -16,7 +16,7 @@
     Things can change unannounced at any time and even a complete breakdown over a longer period of time cannot be excluded with certainty.
     If you would like to use DeReKoVecs for your own research in the longer term, please contact us.
 </p>
-<h3>Scheduled downtimes</h3>
+<h3>Scheduled Downtimes and Announcements</h3>
 <dl id="downtimes">
     <dt></dt><dd>–</dd>
 </dl>