Prem Katha literally means Love Story (Prem=Love, Katha=Story) and the word would mean the same across various Indian languages including Hindi as the these Sanskrit root words are in use in most languages.
Prem Katha is an upcoming HIndi movie starring Prateik Babbar and Amy Jackson. The movie is a remake of Telugu movie Ye Maya Chesave/ Tamil movie Vinnaithaandi Vaaruvaayaa.
Update: The name of the movie is changed to Ek Deewana Tha.