Merge remote-tracking branch 'kobo_book_delete' into Develop

# Conflicts:
#	cps/kobo.py
#	cps/services/SyncToken.py
#	cps/templates/book_edit.html
#	cps/ub.py

cps/templates/book_edit.html

@@ -200,8 +200,16 @@
           <span>{{_('Are you really sure?')}}</span>
       </div>
         <div class="modal-body text-center">
+          <p>
           <span>{{_('This book will be permanently erased from database')}}</span>
           <span>{{_('and hard disk')}}</span>
+		  </p>
+          {% if config.config_kobo_sync %}
+          <p>
+            <span>{{_('Important Kobo Note: deleted books will remain on any paired Kobo device.')}}</span>
+            <span>{{_('Books must first be archived and the device synced before a book can safely be deleted.')}}</span>
+          </p>
+          {% endif %}
         </div>
 
       <div class="modal-footer">

cps/templates/detail.html

@@ -202,6 +202,14 @@
             </label>
           </form>
           </p>
+          <p>
+            <form id="archived_form" action="{{ url_for('web.toggle_archived', book_id=entry.id)}}" method="POST">
+              <label class="block-label">
+                <input id="archived_cb" data-checked="{{_('Restore from archive')}}" data-unchecked="{{_('Add to archive')}}" type="checkbox" {% if is_archived %}checked{% endif %} >
+                <span>{{_('Archived')}}</span>
+              </label>
+            </form>
+          </p>
         </div>
       {% endif %}