> Still, I tried playing "Counterfeit Monkey' with both gluxle
> and git interpreters, and yet the Greek characters are either
> not displayed or scrambled as an ASCII mess.
> [...] so I guess something is wrong with these interpreters.
It isn't Glulx which is the issue here, but Glk. You will need to link
the Glulx interpreter with a Glk implementation which supports Unicode
(which requires recompiling the Glulx interpreter).
However, I don't know which Glk implementations support a Unicode terminal.
GlkTerm supports Unicode I/O with files, but not with the terminal (it will
display a question mark instead).
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(But if it has these words, then actually it isn't blank, isn't it?)