The Wolfenstein II: The New Colossus Language Pack-P... (Polish, or any other) is essential for non-English speakers who want to experience B.J. Blazkowicz’s rampage against the Nazi regime in their native tongue. Although Bethesda and Steam’s implementation remains clunky—requiring manual downloads, region workarounds, and occasional file verification—the result is worth it.
If the in-game menus are giving you trouble, you can force a language change through command line arguments:
-P language pack, manually copy folders, update steam_emu.ini, and expect a 6-9 GB download.