Rmail: support citations with non-ASCII letters in names

 lisp/mail/rmail.el (rmail-font-lock-keywords): Accept non-ASCII
 letters in cite-prefix.

lisp/ChangeLog

+2012-01-04  Eli Zaretskii  <eliz@gnu.org>
+
+	* mail/rmail.el (rmail-font-lock-keywords): Accept non-ASCII
+	letters in cite-prefix.
+
 2012-01-03  Lars Magne Ingebrigtsen  <larsi@gnus.org>
 
 	* mail/smtpmail.el (smtpmail-stream-type): Mention the `ssl' value.

lisp/mail/rmail.el

@@ -791,7 +791,7 @@ that knows the exact ordering of the \\( \\) subexpressions.")
   ;; These are all matched case-insensitively.
   (eval-when-compile
     (let* ((cite-chars "[>|}]")
-	   (cite-prefix "a-z")
+	   (cite-prefix "[:alpha:]")
 	   (cite-suffix (concat cite-prefix "0-9_.@-`'\"")))
       (list '("^\\(From\\|Sender\\|Resent-From\\):"
 	      . 'rmail-header-name)