To find a high-quality Serbian translation, you should check major subtitle databases using the Serbian title or original English title:

: A global repository where you can filter by language specifically for "Serbian." Technical Tips for Proper Synchronization

: This is the primary community-driven site for subtitles in Serbian, Croatian, and Bosnian. Search for "American Heart" or its local title variants.

If you are looking for (titlovi srpski), you are likely referring to the 1992 drama film starring Jeff Bridges.