fix(UIUX): use dynamically changed year in footer

discuss_data/templates/footer.html

@@ -88,7 +88,7 @@
 
     <div class="container-fluid no-padding">
         <div class="text-light bg-primary text-center text-wrap footer-copyright">
-        © 2019 Research Centre for East-European Studies at the University of Bremen and Göttingen State and University Library. All Rights Reserved.
+        © {% now "Y" %} Research Centre for East-European Studies at the University of Bremen and Göttingen State and University Library. All Rights Reserved.
         </div>
     </div>
 </footer>