Add part title to PDf's summary

_layouts/ebook/summary.html

@@ -33,8 +33,16 @@
     <h1>{{ "SUMMARY"|t }}</h1>
     <ol>
         {% for part in summary.parts %}
+            {% if part.title %}
+            <li class="part-title">
+                <h2>{{ part.title }}</h2>
+            </li>
+            {% endif %}
             {{ articles(part.articles) }}
+
+            {% if not loop.last %}
             <li class="divider"></li>
+            {% endif %}
         {% endfor %}
 
         {% if glossary.path %}

src/less/ebook/summary.less

@@ -8,6 +8,10 @@
         padding: 0px;
     }
 
+    h2 {
+
+    }
+
     li {
         list-style: none;