While I understand localization can be useful for a subset of users, at least they could have made the English function names also work, or have a suggestion mechanism to suggest the Spanish translation if you type an English function name. I don't understand why they don't do this.

Anyway, the problems of name localization are nothing compared to the problems of using commas as decimal separator. People from English-speaking countries will never know how many extra hours of life they have from not fiddling with decimal separators, text encoding programming issues, etc.

If memory serves me right, back when MS Office macro viruses were the threat du jour, there was already a bit of a remedy in place for those formats that would translate the formulas and macros of incoming files from a different language version of the same software. This caused secondary waves of "mutated" viruses that had crossed multiple language barriers and came back slightly different but still working, foiling the efforts of checksum based virus scanners.

Not as stupid as translating low level error messages.