fix character broken (MOJIBAKE) of CHANGELOG

git-svn-id: http://svn.redmine.org/redmine/trunk@13063 e93f8b46-1217-0410-a6f0-8f06a7374b81
not use non ASCII characters at CHANGELOG

git-svn-id: http://svn.redmine.org/redmine/trunk@13064 e93f8b46-1217-0410-a6f0-8f06a7374b81