Add UI link button to shelves

cps/templates/shelf.html

@@ -2,9 +2,13 @@
 {% block body %}
 <div class="discover">
   <h2>{{title}}</h2>
+  {% if g.user.role_download() %}
+ <a id="shelf_down" href="{{ url_for('show_shelf_down', shelf_id=shelf.id) }}" class="btn btn-primary">{{ _('Download') }} </a>
+      {% endif %}
   {% if g.user.is_authenticated %}
     {% if (g.user.role_edit_shelfs() and shelf.is_public ) or not shelf.is_public  %}
-      <div id="delete_shelf" data-toggle="modal" data-target="#DeleteShelfDialog" class="btn btn-danger">{{ _('Delete this Shelf') }} </div>
+  
+ <div id="delete_shelf" data-toggle="modal" data-target="#DeleteShelfDialog" class="btn btn-danger">{{ _('Delete this Shelf') }} </div>
       <a id="edit_shelf" href="{{ url_for('edit_shelf', shelf_id=shelf.id) }}" class="btn btn-primary">{{ _('Edit Shelf') }} </a>
       <a id="order_shelf" href="{{ url_for('order_shelf', shelf_id=shelf.id) }}" class="btn btn-primary">{{ _('Change order') }} </a>
     {% endif %}

cps/web.py

@@ -2677,7 +2677,6 @@ def show_shelf(shelf_id):
 
 
 @app.route("/shelfdown/<int:shelf_id>")
-@login_required_if_no_ano
 def show_shelf_down(shelf_id):
     if current_user.is_anonymous:
         shelf = ub.session.query(ub.Shelf).filter(ub.Shelf.is_public == 1, ub.Shelf.id == shelf_id).first()