[gnome-control-center] common: Allow editing UI file with Glade for GTK+ 3.x

[Bastien Nocera <hadess src gnome org>]

commit ab720ab6a9a8346098fa11c9acb190531ddce79b
Author: Bastien Nocera <hadess hadess net>
Date:   Mon Dec 10 15:34:20 2012 +0100

    common: Allow editing UI file with Glade for GTK+ 3.x

 panels/common/language-chooser.ui |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/panels/common/language-chooser.ui b/panels/common/language-chooser.ui
index e3aa17d..ae48227 100644
--- a/panels/common/language-chooser.ui
+++ b/panels/common/language-chooser.ui
@@ -1,5 +1,6 @@
 <?xml version="1.0"?>
 <interface>
+  <!-- interface-requires gtk+ 3.0 -->
   <object class="GtkDialog" id="dialog">
     <property name="height_request">400</property>
     <property name="border_width">5</property>