Bug 320126 "Open new messages in" label is confusing

patch by supernova_00@yahoo.com r=bienvenu

mail/components/preferences/advanced.xul

@@ -127,7 +127,7 @@
 
           <vbox>
             <hbox align="center" pack="start">
-              <label value="&reuseExp.label;"/>
+              <label value="&openMsgIn.label;"/>
             </hbox>
           
             <hbox class="indent">  

mail/locales/en-US/chrome/messenger/preferences/advanced.dtd

@@ -18,7 +18,7 @@
 <!ENTITY showFolderColumns.accesskey   "f">
 <!ENTITY rememberLastMsg.label         "Remember the last selected message">
 <!ENTITY rememberLastMsg.accesskey     "b">
-<!ENTITY reuseExp.label                "Open new messages in:">
+<!ENTITY openMsgIn.label               "Open messages in:">
 <!ENTITY reuseExpRadio0.label          "A new message window">
 <!ENTITY reuseExpRadio0.accesskey      "i">
 <!ENTITY reuseExpRadio1.label          "An existing message window">