[gnome-nibbles] Restore a couple mnemonics

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 1622a0e70c76f29fdae4bf3108ae93867eb4273d
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Wed Jan 15 17:15:53 2014 -0600

    Restore a couple mnemonics
    
    These were lost in the transition from GtkStock.

 src/games-scores-dialog.c |    2 +-
 src/preferences.c         |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/games-scores-dialog.c b/src/games-scores-dialog.c
index fab8fb0..1d6062a 100644
--- a/src/games-scores-dialog.c
+++ b/src/games-scores-dialog.c
@@ -445,7 +445,7 @@ static void games_scores_dialog_init (GamesScoresDialog *self)
  
   gtk_container_add (GTK_CONTAINER (scroll), listview);
 
-  gtk_dialog_add_button (GTK_DIALOG (self), _("Close"),
+  gtk_dialog_add_button (GTK_DIALOG (self), _("_Close"),
                                 GTK_RESPONSE_CLOSE);
   gtk_dialog_set_default_response (GTK_DIALOG (self), 
                                 GTK_RESPONSE_CLOSE);
diff --git a/src/preferences.c b/src/preferences.c
index 4019d7e..d549c8b 100644
--- a/src/preferences.c
+++ b/src/preferences.c
@@ -222,7 +222,7 @@ gnibbles_preferences_cb (GtkWidget * widget, gpointer data)
 
   pref_dialog = gtk_dialog_new_with_buttons (_("Nibbles Preferences"),
                                              GTK_WINDOW (window), 0,
-                                             _("Close"),
+                                             _("_Close"),
                                              GTK_RESPONSE_CLOSE, NULL);
   gtk_container_set_border_width (GTK_CONTAINER (pref_dialog), 5);
   gtk_box_set_spacing