[gnome-nibbles/wip/vala] Don't use title case for a question dialog

[Michael Catanzaro <mcatanzaro src gnome org>]

commit d789a46ce785eba099b015914bf0c150764dfbfb
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Sun Sep 20 12:17:34 2015 -0500

    Don't use title case for a question dialog

 src/gnome-nibbles.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/gnome-nibbles.vala b/src/gnome-nibbles.vala
index 3bfc7db..65593a0 100644
--- a/src/gnome-nibbles.vala
+++ b/src/gnome-nibbles.vala
@@ -363,7 +363,7 @@ public class Nibbles : Gtk.Application
                                             Gtk.DialogFlags.MODAL,
                                             Gtk.MessageType.WARNING,
                                             Gtk.ButtonsType.OK_CANCEL,
-                                            _("Are You Sure You Want to Start a New Game?"));
+                                            _("Are you sure you want to start a new game?"));
         dialog.secondary_text = _("If you start a new game, the current one will be lost.");
 
         var button = (Gtk.Button) dialog.get_widget_for_response (Gtk.ResponseType.OK);