Fixed: Console Warning on MovieTitlesRow due to incorrect variable type

frontend/src/Movie/Details/Titles/MovieTitlesRow.js

@@ -46,7 +46,7 @@ MovieTitlesRow.propTypes = {
   id: PropTypes.number.isRequired,
   title: PropTypes.string.isRequired,
   language: PropTypes.object.isRequired,
-  sourceType: PropTypes.object.isRequired
+  sourceType: PropTypes.string.isRequired
 };
 
 export default MovieTitlesRow;