Awesome video! The music from the Nier means so much to me but it's hard to find videos on the language itself. Especially how to translate the subtitles in game. Thanks for the video!
For vague hope I'm like 99% sure it's based on Hebrew. So much so that you can piece whole words and half sentences. It's a bit like a song a mother would sing to her child, and it's haunting if you know Hebrew. The words eternal summer child are probably the most comprehensible.