delete on intervals.icu confirm - planned sessions

rowers/templates/plannedsessiondeleteconfirm.html

@@ -13,6 +13,11 @@
       <form action="" method="post">
         {% csrf_token %}
         <p>Are you sure you want to delete <em>{{ object }}</em>?</p>
+	{% if object.intervals_icu_id and object.manager.rower.intervals_delete_plannedsession %}
+	<p><input type="checkbox" checked name="intervals_delete" value="yes"> Confirm deletion on intervals.icu</p>
+	{% elif object.intervals_icu_id %}
+	<p><input type="checkbox" name="intervals_delete" value="yes"> Also delete on intervals.icu</p>
+	{% endif %}
         <input class="button red" type="submit" value="Confirm">
       </form>
     </p>