Change 'big5' to 'Big5'

source/data/mappings/convrtrs.txt

 # ******************************************************************************
 # *
 # *   Copyright (C) 1995-2014, International Business Machines
 # *   Corporation and others.  All Rights Reserved.
 # *
 # ******************************************************************************
 
 # If this converter alias table looks very confusing, a much easier to
 # understand view can be found at this demo:
 # http://demo.icu-project.org/icu-bin/convexp
@@ skipping 372 matching lines @@
                         gb2312-1980
                         EUC-CN
                         csGB2312 { IANA }
                         GB_2312-80 { IANA }
                         x-gbk
 
 # GB 18030 is partly algorithmic, using the MBCS converter
 gb18030 { IANA* }      gb18030 { MIME* }  ibm-1392 windows-54936
 
 windows-950-2000
-    big5 { MIME* HTML* }
-    big5-hkscs
+    Big5 { MIME* HTML* }
     cn-big5
     csbig5
     x-x-big5
 
 # Chrome: WHATWG encoding spec has big5-hkscs as an alias for big5
 #   TODO(jshin): Decide if Chrome should follow spec. crbug.com/277040
 ibm-1375_P100-2007 { UTR22* }   # Big5-HKSCS-2004 with Unicode 3.1 mappings. This uses supplementary characters.
                         ibm-1375
                         Big5-HKSCS { MIME* IANA* }
                         big5hk
@@ skipping 30 matching lines @@
     ksc_5601
     windows-949
 
 # We need to keep these aliases so that documents labelled with them
 # are converted to a single U+FFFD instead of being rendered as a gibberish.
 ISO-2022-KR { HTML* MIME* } csISO2022KR { IANA }
 ISO-2022-CN { IANA* HTML* } csISO2022CN  x-ISO-2022-CN-GB
 ISO-2022-CN-EXT { IANA* HTML* }
 HZ-GB-2312 { HTML* IANA* } HZ