[network-manager-applet] connection-editor/vpn-helpers: add missing translation macro

[Thomas Haller <thaller src gnome org>]

commit d090f5dbd78d86e2425dc816237fdfb8b5af18cd
Author: Thomas Haller <thaller redhat com>
Date:   Wed Jul 15 18:22:30 2015 +0200

    connection-editor/vpn-helpers: add missing translation macro

 src/connection-editor/vpn-helpers.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/connection-editor/vpn-helpers.c b/src/connection-editor/vpn-helpers.c
index 8a2b8fa..fb23342 100644
--- a/src/connection-editor/vpn-helpers.c
+++ b/src/connection-editor/vpn-helpers.c
@@ -205,7 +205,7 @@ import_vpn_from_file_cb (GtkWidget *dialog, gint response, gpointer user_data)
                                                     _("Cannot import VPN connection"));
                gtk_message_dialog_format_secondary_text (GTK_MESSAGE_DIALOG (err_dialog),
                                                 _("The file '%s' could not be read or does not contain 
recognized VPN connection information\n\nError: %s."),
-                                                bname, error ? error->message : "unknown error");
+                                                bname, error ? error->message : _("unknown error"));
                g_free (bname);
                g_signal_connect (err_dialog, "delete-event", G_CALLBACK (gtk_widget_destroy), NULL);
                g_signal_connect (err_dialog, "response", G_CALLBACK (gtk_widget_destroy), NULL);