Changed text for data series pill

ckanext/odsh/templates/snippets/package_item.html

@@ -38,7 +38,7 @@ Example:
         {% block heading %}
         {% if package.get('type') == 'collection' %}
         <div class='package-info-pill'>
-          {{ _('Collection') }}
+          {{ _('Data series') }}
         </div>
         {% endif %}
         {%if daterange %}