FailedPrecondition reached the classifier unmatched, so a refusal showed as
"Operation failed". It is the code both of the daemon's deliberate refusals
carry: the update-settings kill switch, and a field an MDM policy manages.
Both are now named — settings_locked and settings_managed_by_mdm, matched on
the message the daemon composes — and FailedPrecondition itself falls back to
change_refused, so a refusal the daemon grows later still reads as a refusal
rather than a failure.
Only the English strings are added. Bundle.Translate falls back to the
default language for a missing key, so other locales show English until the
usual translation pass, rather than the bare "error.<code>" the classifier
would otherwise surface.
Note: the package needs GTK4/WebKit to build, which this machine has not, so
the test is type-checked (go vet, GOOS=windows) but was not executed locally;
CI's Linux job runs it.