[gnome-shell] keyboard: Add a missed translation

[Jasper St. Pierre <jstpierre src gnome org>]

commit 4e114107ed3ddf71c784cb63ca592ee88911d2a4
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Fri Sep 30 17:29:46 2011 -0400

    keyboard: Add a missed translation
    
    The word "tray" should be translated to other languages.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=660600

 js/ui/keyboard.js |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/keyboard.js b/js/ui/keyboard.js
index 2eb355f..1367767 100644
--- a/js/ui/keyboard.js
+++ b/js/ui/keyboard.js
@@ -305,7 +305,8 @@ Keyboard.prototype = {
     },
 
     _getTrayIcon: function () {
-        let trayButton = new St.Button ({ label: "tray", style_class: 'keyboard-key' });
+        let trayButton = new St.Button ({ label: _("tray"),
+                                          style_class: 'keyboard-key' });
         trayButton.key_width = 1;
         trayButton.connect('button-press-event', Lang.bind(this, function () {
             Main.messageTray.toggle();