FIX:fixed some issues with sending prints

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: I27b67091e9449bb9d469f9ded53148e0b1a74369

src/slic3r/GUI/SendToPrinter.hpp

@@ -92,6 +92,7 @@ protected:
 	wxBoxSizer* sizer_thumbnail;
 	wxBoxSizer* m_sizer_main;
 	wxBoxSizer* m_sizer_bottom;
+	wxStaticText* m_file_name;
 
 	bool		enable_prepare_mode{true};
 	bool        m_need_adaptation_screen{ false };