In qcadactions.ts - RS_ActionModifyTriangulate i found text "Triangulate". Seems this is new feature in QCad 2.2. What does this feature? Breaks hatch in to triangle regions?
If there is no good translation, just leave it untranslated.This menu is not visible in QCad 2.1.6.4 or QCad 2.2.0.0 but it might be activated in a later version.