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Problem:
The client is experiencing 404 errors after translating the slug taxonomy of product categories and page URLs into different languages. Additionally, when translating the URL of the 'Nous contacter' page to Spanish ('contactanos'), the footer link in the Spanish version redirects to the French URL instead of the Spanish one.
Solution:
1. For translating product category slugs, we recommend using the WPML > Taxonomy Translation page. After translating, clear the caches (Object cache, WP Rocket) to ensure the translated product category pages work properly in the frontend.
2. For the issue with the page not showing in the correct language, ensure that the page is fully translated into Spanish. If it's not, it will fallback to the French version due to the 'Translatable - use translation if available or fallback to default language' setting in WPML > Settings. Change this to 'Translatable - only show translated items' to avoid such issues.
3. To update the page slug for 'contactanos', you can either edit the page in the admin area and switch to the Spanish language to update it manually, or use the option 'Translate' in the translation editor, which allows the slug to be included in the translation.

If these steps do not resolve your issue or if the solution seems outdated or irrelevant to your case, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the problem persists, please open a new support ticket.