I created a bug report for this issue, but I'd like some help to get it fixed. I'm sure someone here on the forum knows how to do it ;)   Basically the problem is that the new canonical header tags module introduced in 2.3x does not support multi-langague sites as it generates the same canonical url for all the different languages.   The canonical tag should include a parameter for the language as pergoogle guidelines http://googlewebmastercentral.blogspot.be/2010/03/working-with-multiling