What does "Zeig Hail" translate into English as?

I suspect you mean the Nazi salute "Sieg Heil"

This translates as "hail victory", and like a lot of Nazi ritual and regalia has an echo of the Romans about it.

Sieg (Victory) Heil (well-being; welfare) might be translated as "Hail to our victory", but its practical meaning is that a belief in victory is expressed. Something like: We Shall Overcome"...

I agree with Flem-ish about the meaning. I'd suggest the translation: "We shall conquer!" (Compare with "We'll fight and we'll conquer again and again" in the Royal Navy song 'Heart of Oak').

However, as Stew observes, it was used ritualistically, and in the ritual use of language people are often, I think, more focused on the ritual than the exact meaning of the words.