I don't seem to have the de.dict file. Can this be downloaded somewhere else?
Correct: this file exists, and i tried that already but it does not work. Nothing happens if you load another dictionary and it stays on en.dict. And de.dict indeed contains german words, but in another format compared to a custom dictionary. So i asume that it is a planned feature. ...which currently is in a buggy state.
There is actually a German dictionary in "C:\Program Files\Reallusion\iClone 7\Resource\ICTextToSpeech\Dictionary". If you import de.dict from there as a custom dictionary it should work. See https://manual.reallusion.com/iClone_7/ENU/Content/iClone_7/7.9/08-Animation/Facial-Animation/Working-on-Dictionary.htm for information about loading a custom dictionary. BTW, I have no problem with English audio, but it is essential to have a correct transcript of the spoken dialog.