(Blender 2.79, date: 2018/04/15 – 19:46, hash: 80f7249d09a, branch: blender 2.8)

Please see the image attached. Turn on the Cycles Render and the text is found in 'Render' panel, section: Light Paths. The text doesn't exist in po file.

There are also three items in the 'Integrator Presets' whose texts are not in the po file as well.