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> Does anyone actually do that in a production code?

Would you accept teaching code as production code? Specifically, if you were to teach programming to young non English speakers, wouldn't you accept them to use words of their native tongue for variables and such?

> I'd actually consider it a bad idea, as it limits significantly who can manage that code in the future.

Wouldn't you say that solely using roman letters in code would impose a similar limit? In countries where these letters are seldom used (like for instance greek letters in western countries), only those accustomed to them would be able to handle code (as it has been the case until the last decade perhaps).