Contextual Filter with Title and Language
Multiple contextual filters are fine &amp; dandy. 
The issue seems to be that the url prefix being used in a translated/localized content is a bit different from the actual machine code for the language. French is not 'fr-fr' but simply 'fr' in Drupal's views. French Canadian would be 'fr-ca'. 

here is a list of defined languages I use on my site along with their codes. These should be what you're looking to filter on. No issues with multiple filters.