fix erroneous use of i18n.h in a header file

git-svn-id: svn://localhost/ardour2/branches/3.0@13123 d708f5d6-7413-0410-9779-e7cbd77b26cf

gtk2_ardour/gui_object.h

@@ -28,8 +28,6 @@
 #include "pbd/xml++.h"
 #include "pbd/id.h"
 
-#include "i18n.h"
-
 class GUIObjectState
 {
 public:

gtk2_ardour/midi_export_dialog.cc

@@ -19,12 +19,16 @@
 
 #include <gtkmm/stock.h>
 
+#include "pbd/compose.h"
+
 #include "ardour/directory_names.h"
 #include "ardour/midi_region.h"
 #include "ardour/session.h"
 
 #include "midi_export_dialog.h"
 
+#include "i18n.h"
+
 using namespace ARDOUR;
 
 MidiExportDialog::MidiExportDialog (PublicEditor&, boost::shared_ptr<MidiRegion> region)