Bug 168853 Inconsistent capitalization of "Threads With Unread" menu item p=david.tenser@telia.com r=me sr=sspitzer

mailnews/base/resources/locale/en-US/messenger.dtd

@@ -190,7 +190,7 @@ Rights Reserved.
 <!ENTITY collapseAllThreadsCmd.key "\">
 <!ENTITY unreadMsgsCmd.label "Unread">
 <!ENTITY unreadMsgsCmd.accesskey "U">
-<!ENTITY threadsWithUnreadCmd.label "Threads With Unread">
+<!ENTITY threadsWithUnreadCmd.label "Threads with Unread">
 <!ENTITY threadsWithUnreadCmd.accesskey "T">
 <!ENTITY watchedThreadsWithUnreadCmd.label "Watched Threads with Unread">
 <!ENTITY watchedThreadsWithUnreadCmd.accesskey "W">