Where is this description field located at ? I tried went into style.css

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I want to change the name Description into something else, so i went into style.css, but couldn't find this word or anything. So i tried find " Comments / Download ". but couldn't find that word as well, i went into different single page inside the theme editor, found a couple same words, tried edit it and see it live, but it doesn't change that word, who knows which is this under ? :(