Views: changing the language for taxonomy terms
By default views doesn't allow to filter the taxonomy terms by the language, only with nodes. 

But, you can use the Internationalization Views:

http://drupal.org/project/i18nviews

After you enable the module go to relationships and add "Content: Taxonomy terms on node"
Then you can find " Taxonomy term: Language " under filters. This should do the trick.

Good luck.