That’s weird, Launchpad shows correct translation for 16.04: https://translations.launchpad.net/ubuntu/xenial/+source/gedit/+pots/gedit/es/+translate?batch=10&show=all&search=Tab+Width But it’s not the first time Ubuntu/Launchpad added a bad translation on top of GNOME. Nothing we can do about it upstream. Anyway, thank you gorlok for reporting it, and don’t hesitate reporting again if you find a bug in modern gedit/GNOME.