FIX:fixed some issues with sending files

1. send to printer change to send to print sd card
2. update the default error message
3. display networking error messages on the page

Change-Id: Ib82f952486d18ff481ac377aa607b5455b31564b

src/slic3r/GUI/SendToPrinter.hpp

@@ -100,6 +100,7 @@ protected:
 	wxBoxSizer* sizer_thumbnail;
 	wxBoxSizer* m_sizer_main;
 	wxBoxSizer* m_sizer_bottom;
+	wxStaticText* m_file_name;
 
 	bool        m_is_rename_mode{false};
 	bool		enable_prepare_mode{true};