76 The translation “crowd” is given by δῆμος; the word often means a gathering of citizens to conduct public business. Here it is simply the group of people gathered to hear the king’s speech.
77 The imperfect verb ἐπεφώνει (epephōnei) is taken ingressively in the sequence of events. Presumably the king had started his speech when the crowd began shouting.
78 The voice of a god. Contrast the response of Paul and Barnabas in Acts 14:13–15.

In other versions

And the people were shouting, “The voice of a god, and not of a man!”

They shouted, “This is the voice of a god, not of a man.”

The assembled people began to shout, “It’s the voice of a god and not of a man!”

The people gave him a great ovation, shouting, “It’s the voice of a god, not of a man!”

But the people began to call out loudly, “The voice of a god and not of a man!”

And the people gave a shout, saying, It is the voice of a god, and not of a man.

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