Display sortable columns as underlined

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@18838 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/bootstrap/erp5_xhtml_style/SkinTemplateItem/portal_skins/erp5_xhtml_style/erp5.css.xml

@@ -423,6 +423,11 @@ button.sort_button {\n
   border-width: 0;\n
 }\n
 \n
+button.sort_button span {\n
+  color: inherit;\n
+  text-decoration: underline;\n
+}\n
+\n
 img {\n
   border: 0;\n
 }\n

product/ERP5/bootstrap/erp5_xhtml_style/bt/revision

-486
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+487
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