How do I filter a view based on a multilingual alias?
You can not two views with same path.
You need to create copy of the view and change its path.

For french language you need to use filters? When you create your view, you add a new filter and select "Node translation" from the "Groupes" list and the check "Node translation: Language" and click "Add". Then you can chose language(s) on which you want the view to show.