Render series number with comma and outside of link on book page

bookwyrm/templates/book/book.html

@@ -45,18 +45,22 @@
                     {% endif %}
 
                     {% if book.series %}
-                        <meta itemprop="position" content="{{ book.series_number }}">
+                        {% spaceless %}
                         <span itemprop="isPartOf" itemscope itemtype="https://schema.org/BookSeries">
                         {% if book.authors.exists %}
                             <a href="{% url 'book-series-by' book.authors.first.id %}?series_name={{ book.series | urlencode }}"
                                itemprop="url">
                         {% endif %}
                         <span itemprop="name">{{ book.series }}</span>
-                        {% if book.series_number %} #{{ book.series_number }}{% endif %}
                         {% if book.authors.exists %}
                             </a>
                         {% endif %}
                         </span>
+                        {% if book.series_number %}
+                            <span>, #</span>
+                            <span itemprop="position">{{ book.series_number }}</span>
+                        {% endif %}
+                        {% endspaceless %}
                     {% endif %}
                 </p>
             {% endif %}