Is it not policy on this site that quoted matter should be attributed to its author? If the quotation has been translated from its original language, does the translator deserve attribution as well? When translations are quoted without naming a translator, as in this question or this answer, is it fair to assume that we are reading the poster's own translation from the Spanish of Borges or the Ancient Greek of Homer?
Yes, absolutely. Translated works are as much the work of the translator as the author. It's especially important, because if you translate something to ask about it, answerers need to know.
Translations also impact answers, rather significantly. Differences in translations, and choices made during the process, always distort away some meaning, no matter the translator.