פירגוןfeer-GOON[fiʁˈɡun]
open-hearted, ungrudging delight in another person's success
Closest in English: kvelling, kvell, pride. None of them covers it.
Firgun came into Hebrew through the Yiddish farginen: to grant someone their success, free of envy. Israel liked the idea enough to give it a holiday, International Firgun Day, on 17 July. English borrowed kvelling from the same Yiddish well, though you mostly kvell over your own family; firgun is kvelling for strangers.
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Harder than most words so far.
The most common guess for the translation was 'congratulations'. Close, but not it.