use icon from new icon font

added icons for submenu entries

lib/open_project/costs/engine.rb

@@ -165,21 +165,23 @@ module OpenProject::Costs
                :param => :project_id,
                :before => :settings,
                :caption => :cost_objects_title,
-               :html => {:'data-icon2' => 'C'}
+               :html => {:class => 'icon5 icon-stats'}
 
           menu :project_menu,
                :new_budget,
                {:controller => '/cost_objects', :action => 'new' },
                :param => :project_id,
                :caption => :label_cost_object_new,
-               :parent => :cost_objects
+               :parent => :cost_objects,
+               :html => {:class => 'icon5 icon-add'}
 
           menu :project_menu,
                :show_all,
                {:controller => '/cost_objects', :action => 'index' },
                :param => :project_id,
                :caption => :label_view_all_cost_objects,
-               :parent => :cost_objects
+               :parent => :cost_objects,
+               :html => {:class => 'icon5 icon-list-view1'}
         end
       end
     end