Sluggable behavior doesn't work properly with french accents in utf8

In UTF8, "Législation 2008" was "slugged" as "legislation-ta-2-8" which is not correct.

It is caused as a bug in the Doctrine_Inflector::unaccent function.

If $string seems to be UTF8, we use the $chars array to replace accents. But the last line of the $chars array (Norwegian characters replacements) is incorrect :

'Å'=>'Aa','Æ'=>'Ae','Ø'=>'O','æ'=>'a','ø'=>'o','å','aa'

should be replaced by

'Å'=>'Aa','Æ'=>'Ae','Ø'=>'O','æ'=>'a','ø'=>'o','å' => 'aa'