Epic journey around the world
In Norwegian episk means narrative, something from an oral tradition. The word epic has gotten an informal meaning, an exceptionally long and arduous task or activity.
The word epic is used for English games, books, films or poems, which are long and contain a lot of action, usually working with a historical.
As an adjective it is a heroic or grand in scale or character. The word has been given the same meaning in Norwegian, even though it is not formally accepted yet.
En episk film, En episk spurt av Northug. The translation into English is, An epic movie, An epic sprint by Northug (Famous Norwegian skier), but as you have noticed, not yet, formal correct use of the word in Norwegian.
Ordbokartikkel from Bokmålsordboka
episk (from greek epikos, epos) unlike dramatic, lyrical; narrative
episk diktning is epic poetry
episk teater (from German episches Theater, by B. Brecht, 1926) narrative theater; dialectical theater
A translator, like a witness on the stand, should hold up his right hand and swear to "tell the truth, the whole truth and nothing but the truth.