Fix formatting strings when compiling with Wformat options

Imported from debian

--- a/lib/application.c
+++ b/lib/application.c
@@ -352,7 +352,7 @@ static void xnp_application_update_notes
 			XfconfChannel* _tmp16_;
 			const gchar* _tmp17_;
 			_tmp9_ = _ ("Select notes path");
-			_tmp10_ = (GtkMessageDialog*) gtk_message_dialog_new (NULL, 0, GTK_MESSAGE_ERROR, GTK_BUTTONS_CLOSE, _tmp9_);
+			_tmp10_ = (GtkMessageDialog*) gtk_message_dialog_new (NULL, 0, GTK_MESSAGE_ERROR, GTK_BUTTONS_CLOSE, "%s", _tmp9_);
 			g_object_ref_sink (_tmp10_);
 			error_dialog = _tmp10_;
 			_tmp11_ = error_dialog;
@@ -419,7 +419,7 @@ static void xnp_application_update_notes
 		XfconfChannel* _tmp35_;
 		const gchar* _tmp36_;
 		_tmp27_ = _ ("Select notes path");
-		_tmp28_ = (GtkMessageDialog*) gtk_message_dialog_new (NULL, 0, GTK_MESSAGE_ERROR, GTK_BUTTONS_CLOSE, _tmp27_);
+		_tmp28_ = (GtkMessageDialog*) gtk_message_dialog_new (NULL, 0, GTK_MESSAGE_ERROR, GTK_BUTTONS_CLOSE, "%s", _tmp27_);
 		g_object_ref_sink (_tmp28_);
 		error_dialog = _tmp28_;
 		_tmp29_ = error_dialog;
@@ -2082,7 +2082,7 @@ static void xnp_application_delete_windo
 		gint _tmp9_;
 		_tmp3_ = window;
 		_tmp4_ = _ ("Are you sure you want to delete this group?");
-		_tmp5_ = (GtkMessageDialog*) gtk_message_dialog_new ((GtkWindow*) _tmp3_, GTK_DIALOG_DESTROY_WITH_PARENT, GTK_MESSAGE_QUESTION, GTK_BUTTONS_YES_NO, _tmp4_);
+		_tmp5_ = (GtkMessageDialog*) gtk_message_dialog_new ((GtkWindow*) _tmp3_, GTK_DIALOG_DESTROY_WITH_PARENT, GTK_MESSAGE_QUESTION, GTK_BUTTONS_YES_NO, "%s", _tmp4_);
 		g_object_ref_sink (_tmp5_);
 		dialog = _tmp5_;
 		_tmp6_ = dialog;
@@ -2721,7 +2721,7 @@ void xnp_application_open_settings_dialo
 		e = _inner_error_;
 		_inner_error_ = NULL;
 		_tmp0_ = _ ("Unable to open the settings dialog");
-		_tmp1_ = (GtkMessageDialog*) gtk_message_dialog_new (NULL, GTK_DIALOG_DESTROY_WITH_PARENT, GTK_MESSAGE_ERROR, GTK_BUTTONS_CLOSE, _tmp0_);
+		_tmp1_ = (GtkMessageDialog*) gtk_message_dialog_new (NULL, GTK_DIALOG_DESTROY_WITH_PARENT, GTK_MESSAGE_ERROR, GTK_BUTTONS_CLOSE, "%s", _tmp0_);
 		g_object_ref_sink (_tmp1_);
 		error_dialog = _tmp1_;
 		_tmp2_ = error_dialog;
--- a/lib/window.c
+++ b/lib/window.c
@@ -3542,7 +3542,7 @@ void xnp_window_delete_note (XnpWindow*
 		GtkMessageDialog* _tmp13_;
 		gint _tmp14_;
 		_tmp9_ = _ ("Are you sure you want to delete this note?");
-		_tmp10_ = (GtkMessageDialog*) gtk_message_dialog_new ((GtkWindow*) self, GTK_DIALOG_DESTROY_WITH_PARENT, GTK_MESSAGE_QUESTION, GTK_BUTTONS_YES_NO, _tmp9_);
+		_tmp10_ = (GtkMessageDialog*) gtk_message_dialog_new ((GtkWindow*) self, GTK_DIALOG_DESTROY_WITH_PARENT, GTK_MESSAGE_QUESTION, GTK_BUTTONS_YES_NO, "%s", _tmp9_);
 		g_object_ref_sink (_tmp10_);
 		dialog = _tmp10_;
 		_tmp11_ = dialog;