Hi, Antonio,
I'm testing etoys-dev-4.0, with etoysV4.sources and a new VM linux version, If I set the pangoRenderer Preference to Off and I change the language (french, german...)... no problem, but if I want spanish (like my machine) automatically pangoRenderer put On. In this situation, even if I set again pangoRenderer Preference to Off when I save the image automatically pangoRenderer put On again. I do not know reallly if this process is "for my machine only"
I tried to reproduce it, but not successfully. One thing that might affect is that you actually have a different etoys.mo file for Spanish, and your etoys-dev-4.0 finds it? The system trys to decide whether it should turn it on or not by looking at some phrases and specs in the .mo file.
-- Yoshiki