For some reason it seems to always start quotes with an unknown word like "⁇ ust".
The book model is configured like the 345M model (16 and 24 layers) what is probably much too large.
The current german model is configured like the 117M model (12 and 12 layers). The new german model has 16 and 16 layers, as I wanted to compensate for the need to create words from the syllables in the dictionary.
In addition, this parameters result in a model of similar size as the previous one.