Introduced content blocks for flexible footer entries

Change-Id: I737e0b01cbcbd20fe10a920b9644662f3b1629f0
diff --git a/templates/partial/footer.html.ep b/templates/partial/footer.html.ep
index 8a93be4..f1c8d76 100644
--- a/templates/partial/footer.html.ep
+++ b/templates/partial/footer.html.ep
@@ -1,4 +1,3 @@
 <footer>
-  <a href="http://www1.ids-mannheim.de/kl/projekte/korap/"><%= loc 'about' %></a>
-  <%= doc_link_to 'V '. $Kalamar::VERSION, 'korap', 'kalamar' %>
+  %= content_block 'footer'
 </footer>