[zanata/zanata-platform] cb5b79: fix: username validation

[GitHub]

  Branch: refs/heads/ZNTA-1991-username
  Home:   https://github.com/zanata/zanata-platform
  Commit: cb5b79656f7c074e3d4104f01be977ec9b419a10
      https://github.com/zanata/zanata-platform/commit/cb5b79656f7c074e3d4104f01be977ec9b419a10
  Author: Alex Eng <aeng at redhat.com>
  Date:   2017-10-20 (Fri, 20 Oct 2017)

  Changed paths:
    M server/zanata-war/src/main/webapp/account/register.xhtml
    M server/zanata-war/src/main/webapp/admin/create_user.xhtml

  Log Message:
  -----------
  fix: username validation

https://zanata.atlassian.net/browse/ZNTA-1991