Meged with dev2

src/slic3r/GUI/GUI.cpp

@@ -991,6 +991,12 @@ wxString from_u8(const std::string &str)
 	return wxString::FromUTF8(str.c_str());
 }
 
+std::string into_u8(const wxString &str)
+{
+	auto buffer_utf8 = str.utf8_str();
+	return std::string(buffer_utf8.data());
+}
+
 void set_model_events_from_perl(Model &model,
 							    int event_object_selection_changed,
 							    int event_object_settings_changed,