Rename tryton-dialog-* icon into tryton-*

issue474

view/credit_start_form.xml

@@ -2,8 +2,7 @@
 <!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
 this repository contains the full copyright notices and license terms. -->
 <form col="2">
-    <image name="tryton-dialog-information" xexpand="0"
-        xfill="0"/>
+    <image name="tryton-info" xexpand="0" xfill="0"/>
     <group col="2" id="credit_refund">
         <label string="Are you sure to credit those/this invoice(s)?"
             id="credit" colspan="2"