From PR https://github.com/ManageIQ/manageiq/pull/12499: This change makes our Yes and No labels in patternfly styled check box inputs translatable.
We merged latest translations for 5.8 only recently, which is why you see the problem. The translations should be available in next 5.8. build.
PR: https://github.com/ManageIQ/manageiq-ui-classic/pull/975
yes/no and on/off labels are translated in checkbox tag. Verified Version: 5.8.0.12-rc1.20170425180304_4f35996
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2017:1367