Tercüme - Türkçe-İngilizce - Dünyadaki en geçerli sey öncelikle kendi iç...

I think you should use "the most desired".
I also suggests "above all" instead of foremost.
Isn't "huzur" translated by "peace, instead of "happiness"?

Thank you very much for the translation!

you're welcome
it hasnt been approved yet though