[FIX] mass_mailing: escape the mailing list name

Task-2241443

closes odoo/odoo#50488

X-original-commit: afa2153a
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

addons/mass_mailing/static/src/js/unsubscribe.js

@@ -48,7 +48,7 @@ odoo.define('mass_mailing.unsubscribe', function (require) {
     if (unsubscribed_list){
         $('#subscription_info').html(_.str.sprintf(
             _t("You have been <strong>successfully unsubscribed from %s</strong>."),
-            unsubscribed_list
+            _.escape(unsubscribed_list)
         ));
     }
     else{