[orca] Move a forgotten messages string into messages.py

[Joanmarie Diggs <joanied src gnome org>]

commit 9896f0d52e2aa0d06aeec15d3d98efdcc49c4166
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Tue Jun 18 07:06:40 2013 -0400

    Move a forgotten messages string into messages.py

 src/orca/messages.py       |    7 +++++++
 src/orca/orca_gui_prefs.py |    5 +----
 2 files changed, 8 insertions(+), 4 deletions(-)
---
diff --git a/src/orca/messages.py b/src/orca/messages.py
index c08cae3..b3a74b9 100644
--- a/src/orca/messages.py
+++ b/src/orca/messages.py
@@ -1302,6 +1302,13 @@ PARAGRAPH_UNSELECTED_DOWN = _("paragraph unselected down from cursor position")
 # pressing Ctrl+Shift+UP.
 PARAGRAPH_UNSELECTED_UP = _("paragraph unselected up from cursor position")
 
+# Translators: This message appears in a warning dialog when the user performs
+# the command to get into Orca's preferences dialog when the preferences dialog
+# is already open.
+PREFERENCES_WARNING_DIALOG = \
+    _('You already have an instance of an Orca preferences dialog ' \
+      'open.\nPlease close it before opening a new one.')
+
 # Translators: This message is an indication of the position of the focused
 # slide and the total number of slides in the presentation.
 PRESENTATION_SLIDE_POSITION = _("slide %(position)d of %(count)d")
diff --git a/src/orca/orca_gui_prefs.py b/src/orca/orca_gui_prefs.py
index 4df894e..518571e 100644
--- a/src/orca/orca_gui_prefs.py
+++ b/src/orca/orca_gui_prefs.py
@@ -3132,10 +3132,7 @@ class WarningDialogGUI(Gtk.MessageDialog):
     def __init__(self):
         Gtk.MessageDialog.__init__(self)
         self.set_property('message-type', Gtk.MessageType.INFO)
-        msg = _('You already have an instance of an Orca preferences dialog ' \
-                'open.\nPlease close it before opening a new one.')
-        self.set_property('text', msg)
-
+        self.set_property('text', messages.PREFERENCES_WARNING_DIALOG)
         self.add_button('gtk-ok', Gtk.ResponseType.OK)
         self.connect('response', self.onResponse)
         self.connect('destroy', self.onDestroy)