turn basket into a form

lingo/templates/lingo/combo/basket.html

@@ -1,10 +1,13 @@
 {% load i18n %}
 {% if total %}
 <h3>{% trans "Basket" %}</h3>
+<form>
 <ul>
   {% for item in items %}
-  <li>{{ item.subject }}: {{ item.amount }} €</li>
+  <li><label><input type="checkbox" value="{{ item.id }}" checked/> {{ item.subject }}: {{ item.amount }} €</label> (<a href="{{ item.source_url}}">voir</a>)</li>
   {% endfor %}
   <li><strong>{% trans "Total:" %}</strong> {{ total }} €</li>
 </ul>
+<input type="submit" value="{% trans "Pay selected items" %}"/>
+</form>
 {% endif %}