Expressing congratulations is a common social practice. In Kannada, the phrase "Hearty Congratulations" translates to something similar to "ಅಭಿನಂದನೆಗಳು" (Abhinandanegalu) or more emphatically, "ಮನಃಪೂರ್ವಕ ಅಭಿನಂದನೆಗಳು" (Manahpoorvaka Abhinandanegalu) which means 'Heartfelt Congratulations'. Context matters; consider the relationship with the person and the nature of the success.