fdo#77506: Enable this check.

Change-Id: Ib4ad7c1a1583b9fde1a06dc8e355442f10bb9bec
fdo#77506: More reliable way to determine label strings.

Not beautiful, but doable.

Change-Id: I6f3b00d620e7d7d19cc05ec4239deeb14d0d5201