[BUG #6934] updated to CLDR v.23.1 (of 2013-05-15)
[BUG #6934] updated to CLDR v.23.1 (of 2013-05-15)
[BUG #6934] switched from LICENSE.html to unicode-license.txt

- the former being a downloaded version of the Terms of Use
  (http://www.unicode.org/copyright.html), which also contains the license
- the latter one is the pure license, and is part of the core.zip official
  download
- (easier to read and easier to maintain)
- it still contains the link to the copyright.html (just in case)