CREATE TABLE table_15503 ("Country" TEXT, "Film title used in nomination" TEXT, "Language" TEXT, "Original name" TEXT, "Director" TEXT)

Name the film title for okkar milli: hita og unga dagsins
SELECT "Film title used in nomination" FROM table_15503 WHERE "Original name" = 'okkar á milli: í hita og þunga dagsins'
SELECT "Film title used in nomination" FROM "table_15503" WHERE "Original name" = 'okkar á milli: í hita og þunga dagsins'