I have made a modification to the last version of the plugin for those who don't want to edit code.
claudemlandry your modification uses JavaScript and PHP for something that can be achieved solely modifying the javascript code. It might work but it isn't very clean.
For the french speaking users here is an explanation on how you should update the plugin.
I have submitted a comment to worpdress seo plugin forums, and a patch to Yoast. I don't know when he is going to integrate it.
I hope you find it useful.
