Replace 'own' js table sorting by stupidtable plugin

app/views/deliveries/_stock_article_for_adding.html.haml

@@ -1,9 +1,9 @@
 - css_class = ( @delivery and @delivery.includes_article? article ) ? ( 'unavailable' ) : ( false )
 %tr{:id => "stock_article_#{article.id}", :class => css_class}
-  %td.sort-by-name= article.name
+  %td= article.name
   %td{:data => {:toggle => :tooltip, :title => render(:partial => 'shared/article_price_info', :locals => {:article => article})}}= number_to_currency article.price
   %td= article.unit
-  %td.sort-by-category= article.article_category.name
+  %td= article.article_category.name
   %td
     = link_to t('.action_edit'), edit_stock_article_supplier_deliveries_path(@supplier, :stock_article_id => article.id), remote: true, class: 'btn btn-mini'
     = link_to t('.action_other_price'), copy_stock_article_supplier_deliveries_path(@supplier, :old_stock_article_id => article.id), remote: true, class: 'btn btn-mini'