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Thanks, xwordfan.
That's annoying. I knew what I was supposed to be looking for. I just didn't put 'A' in front of GREEN STAR.
Back to it in a min.

I must be more dim than usual. After spending far too long looking at the € and its mirror image symbol the advice above to look for a green star was the PDM. And I see the 10 letters that spell out A GREEN STAR. Fine, but what does the last sentence of the preamble mean? "Translated" also has 10 letters, but writing those letters instead leads to non-words, which can't be right.

cockie, if you translate "a green star" into the 'other' language, you should get "verda stelo". and changing all those letters in the vertices should lead to a grid full of real words.

A beautiful puzzle, imho, from one of the classiest setters

Wow! Thanks.