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Re:A new Einstein cross is discovered by oska on Tuesday March 26, 2019 @12:25AM (#19489293)
Wiktionary is good for finding what languages a particular sequence of characters appears in.

https://en.wiktionary.org/wiki/kvasar

According to that entry, it appears in both Swedish and Czech (as an alternate spelling).

Given the commenter's username is krokku and the fact that "krok ku" means "(a) step forward/towards" in Czech, I think we can assume that the commenter is Czech.

Re:A new Einstein cross is discovered by bhaak on Tuesday March 26, 2019 @04:00AM (#19489969)
Two entries are not that much. On Wikipedia you can look at the list of articles in other languages.

Or go directly to Wikidata https://www.wikidata.org/wiki/Q83373

Re:A new Einstein cross is discovered by oska on Tuesday March 26, 2019 @04:15AM (#19490028)
Ah, interesting. So I see it also appears in Danish, Estonian and Norwegian.

But with the additional clue from the username I'm still betting on Czech.