Tweak groupbox look. Bug 189101, r=biesi, sr=jag

suite/common/pref/pref-applications-edit.xul

@@ -406,7 +406,7 @@
   <separator class="thin"/>
 
   <groupbox>
-    <description value="&handling.label;"/>
+    <caption label="&handling.label;"/>
     <radiogroup id="handler">
       <radio id="useSystemDefault" label="&useDefault.label;" accesskey="&useDefault.accesskey;" oncommand="doEnabling();"/>
       <hbox align="center">

suite/locales/en-US/chrome/common/pref/pref-applications-edit.dtd

@@ -9,7 +9,7 @@
 <!ENTITY  description.label                     "Description:">
 <!ENTITY  description.accesskey                 "d">
 
-<!ENTITY  handling.label                        "When a file of this type is encountered:">
+<!ENTITY  handling.label                        "When a file of this type is encountered">
 <!ENTITY  useDefault.label                      "Open it using the default application">
 <!ENTITY  useDefault.accesskey                  "o">
 <!ENTITY  saveToDisk.label                      "Save it to Disk">