there are around 250 audio files for each language. one for each various helper and each associated action. and sometimes, the helper will return a random response to an action. there are also time, weather and sunrise/sunset broadcast messages.
basically, those handful of missing files only error at load and will simply play an "empty" sound file when and if called on in the game. so it should work fine and not crash anything. that's how they have gone unnoticed for this long.