Q: pages localized in French on iCloud (Mac OS)

Yes.Check here:

Notes de version applicables à Pages pour iCloud

Yes, you are missing something.

Login to your iCloud account with your browser: https://www.icloud.com

Click Pages, on the right, click your Username and choose Account Settings > change the Language to Français 

ckuan wrote:

 

 

Click Pages, on the right, click your Username and choose Account Settings > change the Language to Français 

That does not put any menus, etc. or spellcheck into French on my machine.  As it says

I got the menu:

Yes, the file storage screen is localized, but if you actually create a document you will see that the app itself and all its menus are in English.

Bertrand Morin wrote:

 

When I go to iCloud on my Imac, Pages is in a Beta version and only in English. On my Mac, Pages is in french! Am I missing something?

There are still huge differences between the iwork web apps and the real app versions for OS X and iOS.  Localization/spellcheck are examples.  Ask Apple to fix this via

http://www.apple.com/feedback