Add missing gettext into UserValidationService
Add missing gettext into UserValidationService

https://bugzilla.redhat.com/show_bug.cgi?id=1384490
(transferred from ManageIQ/manageiq@abc941a543896819f7f710502d0a30fb0a9eb612)

ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic