Actually, there´s no verb at all... "Tak" is a substantive, so the sentence could be directed to one person only or more than one (in both cases, it would be "you" in English, since "you" can be both singular and plural).
It would correspond to "(Vielen) Dank für..".
But I actually believe this translation request should not have been translated in the first place, since there's no conjugated verb?