fixing issue #64

this seems like a problem with wp function, only if its throwing 404 errors.

http://codex.wordpress.org/Function_Reference/sanitize_title

this fixes the critical issue #64

it is a revert of issue #45 with the commit 
https://github.com/not-only-code/qtranslate-slug/commit/5b5c2d526525d3df874a5bdf85c5fd623af8fda5