How to set VIM to make it knows unicode? It is unbelievably easy.
VIM nowadays already prepared to work with multi-byte character sets. What lacks is just to enable it. I do in this way:
# cat >> /etc/vim/vimrc.local
The first line is to tell VIM prepare for those encodings. The second line is to ask VIM to assume the source file is in UTF-8 by default. The third line means when VIM saves a file, make it encoded in UTF-8 as well.