I do not know if the word "love" was substituted for "Jesus". That was just a guess -- it sounds like a modern idea to my ears, but it is also true that 'love' scans differently from 'Jesus' and "Savior", and 'love' is the one fits the melody. So it may be original.
Or the whole verse may be new, along with the "tyrants tremble" verse. I don't know. That's why I asked. :-)
Personally, I like the verse (and the song) as it is poplularly sung now. And I see no reason why there cannot be two, equally legitimate versions of the song: One to sing in Christian worship, and one to sing for universal (all faith) social causes.