Link to ICU License in core feature pack is wrong

As stated in: https://issues.jboss.org/browse/JBEAP-12186?focusedCommentId=13444795&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13444795

OTOH I can see "ICU License" external link is wrong - should be https://svn.apache.org/repos/asf/xerces/java/tags/Xerces-J_2_11_0/LICENSE.icu4j.html (or http://source.icu-project.org/repos/icu/tags/release-50-1-2/icu4j/main/shared/licenses/license.html)
Local copy have to be updated accordingly.