optimizing mega RSS

rss.xml

@@ -12,11 +12,20 @@ layout: null
     <title>{{ site.title }}</title>
     <description>{{ site.description }}</description>
     <link>{{ site.url }}</link>
-    <language>en-us</language>
+    <language>{{ site.lang }}</language>
     <copyright>Creative Commons CC-BY-SA</copyright>
-    <lastBuildDate>{{ site.time | date_to_xmlschema }}</lastBuildDate>
-    <pubDate>{{ site.time | date_to_xmlschema }}</pubDate>
-    <docs>http://blogs.law.harvard.edu/tech/rss</docs>
+    <lastBuildDate>{{ site.time | date_to_rfc822 }}</lastBuildDate>
+    <pubDate>{% for track in site.tracks limit: 1 %}{{ track.last_modified_at | date_to_rfc822 }}{% endfor %}</pubDate>
+    <docs>https://cyber.harvard.edu/rss/rss.html</docs>
+    <generator>Jekyll</generator>
+    <image>
+      <url>{{ site.url }}{{ site.logo }}</url>
+      <title>{{ site.title }}</title>
+      <link>{{ site.url }}</link>
+      <width>480</width>
+      <height>480</height>
+    </image> 
+    <managingEditor>{{ site.author.email }}</managingEditor>
     <webMaster>{{ site.author.email }}</webMaster>
 
     <itunes:author>{{ site.author.name }}</itunes:author>
@@ -45,7 +54,7 @@ layout: null
 <description> &lt;img src=&quot;{{ post.image }}&quot; /&gt; {{ post.content | xml_escape }}</description>
 <enclosure url="{{ post.mp3 }}?ref=rss" type="audio/mpeg"/>
 <category>Podcasts</category>
-<pubDate>{{ post.date | date_to_xmlschema }}</pubDate>
+<pubDate>{{ post.date | date_to_rfc822 }}</pubDate>
 
 <itunes:author>Sakrecoer</itunes:author>