diff --git a/static/js/message_list.js b/static/js/message_list.js
index 05d698f1fa..a23ac6e852 100644
--- a/static/js/message_list.js
+++ b/static/js/message_list.js
@@ -343,15 +343,18 @@ exports.MessageList.prototype = {
     },
 
     subscribed_bookend_content: function (stream_name) {
-        return "You subscribed to stream " + stream_name;
+        return i18n.t("You subscribed to stream __stream__",
+                      {stream: stream_name});
     },
 
     unsubscribed_bookend_content: function (stream_name) {
-        return "You unsubscribed from stream " + stream_name;
+        return i18n.t("You unsubscribed from stream __stream__",
+                      {stream: stream_name});
     },
 
     not_subscribed_bookend_content: function (stream_name) {
-        return "You are not subscribed to stream " + stream_name;
+        return i18n.t("You are not subscribed to stream __stream__",
+                      {stream: stream_name});
     },
 
     // Maintains a trailing bookend element explaining any changes in