EDX-726: Refine messages for service site
EDX-726: Refine messages for service site

nttks/jenkins-test,nttks/edx-platform,nttks/edx-platform,nttks/jenkins-test,nttks/jenkins-test,nttks/edx-platform,nttks/jenkins-test,nttks/edx-platform,nttks/edx-platform,nttks/jenkins-test