That's the "Royal 'We.'" European kings and queens have a convention of referring to themselves in the first person plural. I do not know why. But the famous statement "We are not amused" has become, in popular lore, pretty much a summary of Victoria's reign.
One would expect the King James (<---HINT!) Bible to observe such conventions. I wouldn't read too much into the plural pronoun.
I believe its a translation from Hebrew.