Dear Nicola,
I’ve spent a couple of hours on this and got to the root of the problem, and have to admit that it was totally my fault. I’ve fixed all translatable strings in the template files, yet the changes are too large to post a fix here – I’ve uploaded the fix as a new version of the theme to ThemeForest, it should be approved and available in one or two days. Meanwhile, if the issue is urgent for you, you can send me your admin credentials to support@satoristudio.net (no disclosure guaranteed) and I can update the theme files for you.
I apologize for any inconveniences, and thank you for pointing out the issue!
Best,
Andrew | Satori