move code of conduct to footer; also handle language presentation of impressum

Author: knarrff

_includes/footer.html

@@ -1,5 +1,11 @@
 <div class="footer">
-	<a href="{{ "./imprint.html" }}">Impressum (legal notice)</a> | 
+  {% if lang contains "/en/" %}
+	  <a href="{{ "./imprint.html" }}">Legal notice</a> | 
+    <a href="{{ "./coc.html" }}">Code of Conduct</a> | 
+  {% else %}
+	  <a href="{{ "./imprint.html" }}">Impressum</a> | 
+	  <a href="{{ "./coc.html" }}">Verhaltenskodex</a> | 
+  {% endif %}
 	<a href="https://github.com/DE-RSE/de-rse.github.io">Edit on GitHub</a> | 
 	<a href='{{ "/feed.xml" | prepend: site.baseurl }}'><img src='{{ "/assets/img/site/feed-icon.png" | prepend: site.baseurl }}' alt='Atom 1.0 Feed' style="height: 20px;"></a> | 
 	<span style="position: relative; top: 6px;"><a href="https://twitter.com/RSE_de?ref_src=twsrc%5Etfw" class="twitter-follow-button" data-show-count="false" data-dnt="true" alt="Twitter account">Follow @RSE_de</a><script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script></span> |