In list of articles in multi part series show article title in the tool tip

Update #95

templates/_includes/multi_parts.html

@@ -4,7 +4,7 @@
         {% for part_article in article.metadata.parts_articles %}
             <li {% if part_article == article %}class="active-part"{% endif %}>
             {% if part_article != article %}
-            <a href="{{ SITEURL }}/{{ part_article.url }}">Part {{loop.index}}</a>
+            <a href="{{ SITEURL }}/{{ part_article.url }}" title="part_article.title">Part {{loop.index}}</a>
             {% else %}
             Part {{loop.index}}
             {% endif %}