Consistent number formatting: displayable counts

Author: jeremyh

cubedash/templates/overview.html

@@ -73,7 +73,11 @@ <h1><strong>{{ product.name }}</strong>{{ product_args_label }}</h1>
                     </a>
 
                     {% if selected_summary.dataset_count != selected_summary.footprint_count %}
-                        ({{ selected_summary.footprint_count or 'None' }} displayable)
+                        {%- if selected_summary.footprint_count -%}
+                            ({{ '{:,d}'.format(selected_summary.footprint_count) }} displayable)
+                        {%- else -%}
+                            (None displayable)
+                        {%- endif -%}
                     {% endif %}
 
                     <ul>