Zasubskrybuj, aby pobrać
Rochelle German Voice | Rochelle Deutsche Stimmen

Changes Rochelle's voices to the German dub. There are still some English sounds, though.
You normally get this by right clicking the game > Properties > Language > Deustch, then the game updates and you can find the files in the game's folder > left4dead2_dlc3_GERMAN

No soundcache, but it should work immediately without GCFScape stuff.
Tell me if there's fax machine/screeching sounds because that means I need to learn how to make sound cache.