fix issue of fold expressions test(#320,#321)

include/nana/gui/msgbox.hpp

@@ -255,7 +255,11 @@ namespace nana
 		bool show_modal(Args&& ... args)
 		{
 			std::vector<abstract_content*> contents;
+#ifdef __cpp_fold_expressions
+			(contents.emplace_back(&args), ...);
+#else
 			_m_fetch_args(contents, std::forward<Args>(args)...);
+#endif
 
 			if (contents.empty())
 				return false;

include/nana/internationalization.hpp

@@ -1,7 +1,7 @@
 /*
  *	An Implementation of i18n
  *	Nana C++ Library(http://www.nanapro.org)
- *	Copyright(C) 2003-2016 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2003-2018 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0.
  *	(See accompanying file LICENSE_1_0.txt or copy at