At first I thought this was way too few; but TBH it would make the class sizes no worse than 1970s/80s UK and the kids are likely to be better behaved.
That is of course assuming these are individual extra classes for the refugee kids and the new teachers are not diverted to other subjects/classes for everyone else in the school; which might not be unlikely given there is already a shortage of teachers in Germany in many areas before the refugee crisis (there is also a shortage of children across Northern Europe!)
If the German government is going to do this I think they should also put all the learning materials online at the public broadcasters websites so the teachers can all get to them easily and everyone else in the EU or any age who might want to learn German as a second/third language can use them; as that could help everybody in the long term…
EN : Germany recruits 8,500 teachers to teach German to 196,000 child refugees | World news | The Guardian
DE : Flüchtlinge: Länder schufen bis jetzt 8200 Sprachklassen – manager magazin
