[back] Use proper styling of 'C++ 2014'

Author: tkoeppe

source/back.tex

@@ -18,7 +18,7 @@
 
 \clearpage
 \input{xrefdelta}
-\renewcommand{\glossaryname}{Cross references for ISO C++ 2014}
+\renewcommand{\glossaryname}{Cross references for ISO \CppXIV}
 \renewcommand{\preglossaryhook}{All section labels from
 ISO \CppXIV (ISO/IEC 14882:2014, \doccite{Programming Languages --- \Cpp})
 are present in this document, with the exceptions described below.\\}