[five-or-more] Use an imperative verb for the new dialog's action

[Michael Catanzaro <mcatanzaro src gnome org>]

commit d9e14e4f1b70ca6bd0a9d6f5315b39325d3e68fe
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Wed Dec 17 11:26:47 2014 -0600

    Use an imperative verb for the new dialog's action
    
    https://developer.gnome.org/hig/stable/dialogs.html
    
    https://bugzilla.gnome.org/show_bug.cgi?id=739826

 src/five-or-more.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/src/five-or-more.c b/src/five-or-more.c
index 2780ece..ff2585b 100644
--- a/src/five-or-more.c
+++ b/src/five-or-more.c
@@ -1303,9 +1303,14 @@ size_callback (GtkWidget * widget, gpointer data)
     restart_game_dialog = gtk_message_dialog_new (GTK_WINDOW (pref_dialog),
                                                  GTK_MESSAGE_WARNING,
                                                  flags,
-                                                 GTK_BUTTONS_OK_CANCEL,
+                                                 GTK_BUTTONS_NONE,
                                                  _("Are you sure you want to restart the game?"));
 
+    gtk_dialog_add_buttons (GTK_DIALOG (restart_game_dialog),
+                            _("_Cancel"), GTK_RESPONSE_CANCEL,
+                            _("_Restart"), GTK_RESPONSE_OK,
+                            NULL);
+
     gint result = gtk_dialog_run (GTK_DIALOG (restart_game_dialog));
     gtk_widget_destroy (restart_game_dialog);