More specific labels for Win and Lin accessibility settings

Replace "gpii-NPGatheringTool-desktopGroupLabel" with "gpii-NPGatheringTool-gnomeGroupLabel" and "gpii-NPGatheringTool-easeOfAccessGroupLabel" for Fedora and Windows, respectively. So "Desktop" becomes "Universal Access Settings" (Fedora) or "Ease of Access Center" (Windows).