"Way to go, you got it right!" and worse, "Oh Snap, better luck next time." are, at a minimum, obnoxious upon repetition, and at worst, completely inappropriate for certain learner types. It would be great to have feedback responses be editable on a site basis, or at least per-course.
As an alternative, if making them editable per-site is a big job and will be delayed, at least use non-idiomatic, non-cute, non faux-teenage responses. Have pity on the learners.