Eh. It's bad law, sure, but it's not OMGFASCIST!!!11 bad.
It's not too much of a stretch for a nation with an official language to insist that preachers be able to speak it. And it's not hard to understand why they'd want to get control of foreign funds flowing through mosques given how frequently those avenues have been used to support radicalization in the past.
Balog's right, if there really have been that many Austrians joining ISIS, then they've got a real problem on their hands. If true, then Austrians appear to be at far more at risk from radical Islam than they are from the government's weak sauce response to radical Islam.
Again, I don't support the new law, but let's keep things in perspective.