This is a term that, as far as I know, I can be credited with having coined, composed out of my rudimentary understanding of the syntax of the artificially created language Interlingua.
The adjective (Interlingua) humanitero / (Spanish) humanitero / (English) humaniter is a derivative from (Interlingua) humaniteria / (Spanish) humanitería / (English) humanitery, which is also (I believe) of my own coinage, intended to denote a creative skill (or craft), the raw form and end product of which is (Latin) humanitas, aka the cultivation of human virtue.
