[subscribe by mail] accents in mail exerpt

hello !
Wel all in title : the excerpt in email notification does not take accents so I have a
Cher abonn, (without é)
Accompagnement Etudiant a publi (without é)
BUT the post excerpt content does have its accents :
j'ai été obligé
mmmmm ?
The é hardcoding does not work neither :
$subscribe_by_email_instant_notification_content = __("Cher abonné,
but I have in the code :
BLOGNAME a publi eacute un nouvel article : POST_TITLE
the file subscribe-by-email.php is coded in ansi, but if I save it as utf8 I have an error

(sorry for the eacute the forum translate them in good accents )