Unified wording for recently added books, series, categories, etc in opds and web UI ( #1045)

Added file formats and languages to opds feed

cps/templates/feed.xml

@@ -53,7 +53,9 @@
         <name>{{entry.publishers[0].name}}</name>
       </publisher>
     {% endif %}
-    <dcterms:language>{{entry.language}}</dcterms:language>
+    {% for lang in entry.languages %}
+      <dcterms:language>{{lang.lang_code}}</dcterms:language>
+    {% endfor %}
     {% for tag in entry.tags %}
     <category scheme="http://www.bisg.org/standards/bisac_subject/index.html"
               term="{{tag.name}}"

cps/templates/index.xml

@@ -28,7 +28,7 @@
     <content type="text">{{_('Popular publications from this catalog based on Rating.')}}</content>
   </entry>
   <entry>
-    <title>{{_('New Books')}}</title>
+    <title>{{_('Recently added Books')}}</title>
     <link href="{{url_for('opds.feed_new')}}" type="application/atom+xml;profile=opds-catalog"/>
     <id>{{url_for('opds.feed_new')}}</id>
     <updated>{{ current_time }}</updated>
@@ -72,19 +72,33 @@
     <content type="text">{{_('Books ordered by publisher')}}</content>
   </entry>
   <entry>
-    <title>{{_('Category list')}}</title>
+    <title>{{_('Categories')}}</title>
     <link href="{{url_for('opds.feed_categoryindex')}}" type="application/atom+xml;profile=opds-catalog"/>
     <id>{{url_for('opds.feed_categoryindex')}}</id>
     <updated>{{ current_time }}</updated>
     <content type="text">{{_('Books ordered by category')}}</content>
   </entry>
   <entry>
-    <title>{{_('Series list')}}</title>
+    <title>{{_('Series')}}</title>
     <link href="{{url_for('opds.feed_seriesindex')}}" type="application/atom+xml;profile=opds-catalog"/>
     <id>{{url_for('opds.feed_seriesindex')}}</id>
     <updated>{{ current_time }}</updated>
     <content type="text">{{_('Books ordered by series')}}</content>
   </entry>
+  <entry>
+    <title>{{_('Languages')}}</title>
+    <link href="{{url_for('opds.feed_languagesindex')}}" type="application/atom+xml;profile=opds-catalog"/>
+    <id>{{url_for('opds.feed_languagesindex')}}</id>
+    <updated>{{ current_time }}</updated>
+    <content type="text">{{_('Books ordered by Languages')}}</content>
+  </entry>
+  <entry>
+    <title>{{_('File formats')}}</title>
+    <link href="{{url_for('opds.feed_formatindex')}}" type="application/atom+xml;profile=opds-catalog"/>
+    <id>{{url_for('opds.feed_formatindex')}}</id>
+    <updated>{{ current_time }}</updated>
+    <content type="text">{{_('Books ordered by file formats')}}</content>
+  </entry>
   <entry>
     <title>{{_('Public Shelves')}}</title>
     <link  href="{{url_for('opds.feed_shelfindex', public='public')}}" type="application/atom+xml;profile=opds-catalog"/>