Include the slug transliteration plugin into the core of GS

[yojoe]

I was getting lastly some headaches with strtr() and mkdir() functions along with chars in 'abcd' format, giving me an awful sausage in folder names.
Thus I'm more for str_replace with array using assignment operators.
But if you already use strtr succesfully, I have nothing against this way

Hopefully backend theme is utf-8, and there shouldn't be problems with converting char codes (I get chills every time I hear about iconv/mb_string).