Fix the label of Custom Button Events for infra providers
Fix the label of Custom Button Events for infra providers

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1668691

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