This thread is resolved. Here is a description of the problem and solution.
Problem:Woocommerce Categories not picking up Images for new languages
Solution:This is happening because if you go to WPML->Settings->Custom Term Meta Translation -> thumbnail_id is set to "Dont Translate". Instead it needs to be set to "copy"
also it is recommended to translate the category terms from WooCommerce>>WooCommerce Multilingual>>Categories because of the easy sync to the secondary language.
You can also translate the Term from Product categories screen, but you have to manually upload the Image file. Because we have to enter all the values in the edit screen fields.
The best way to resolve this issue since you have already added the translations to French is to go to WooCommerce>>WooCommerce Multilingual>>Categories and click on "Copy to all languages" this will overwrite the current translations of your categories and copy the media to all your languages
This is the technical support forum for WPML - the multilingual WordPress plugin.