Add time to announcement quick edit

Fix picture for news quick edit
Fix tags not saving when empty
Hide role in quick edit

app/views/admin/assets/_form.html.erb

@@ -26,6 +26,7 @@
             <%= content_tag :label, :class => "checkbox inline" do -%>
                 <%= check_box_tag 'asset[tag_ids][]', tag.id, @asset.tag_ids.include?(tag.id) %>
                 <%= tag[I18n.locale] %>
+                <%= hidden_field_tag 'asset[tag_ids][]', '' %>
             <% end %>
         <% end %>
     </div>