I want the WooCommerce plugin to display French text ( fr_FR ). The rest of Wordpress is correctly installed in French, but WooCommerce still shows English.
Since language packs version 2.2 are not included. This message is displayed on the admin page:

The recommended automatic procedure “Translation Update” includes providing FTP access to my server, which I would like to avoid.
The WooCommerce git repository has fr_FR translations:
https://github.com/woothemes/woocommerce-language-packs/raw/master/packages/fr_FR.zip
I unzipped this in the same folder as the default English files.
$ ls -l wp-content/plugins/woocommerce/i18n/languages total 1320 -rw-r--r-- 1 knarf users 211452 24 sept. 18:01 fr_FR.zip -rw-r--r-- 1 knarf users 116765 22 sept. 10:48 woocommerce-admin-fr_FR.mo -rw-r--r-- 1 knarf users 211901 22 sept. 10:48 woocommerce-admin-fr_FR.po -rw-r--r-- 1 knarf users 162575 18 sept. 14:48 woocommerce-admin.pot -rw-r--r-- 1 knarf users 163575 22 sept. 10:48 woocommerce-fr_FR.mo -rw-r--r-- 1 knarf users 268719 22 sept. 10:48 woocommerce-fr_FR.po -rw-r--r-- 1 knarf users 208795 18 sept. 14:48 woocommerce.pot
I tried installing WPLANG on the French wp-config.php :
define ('WPLANG', 'fr_FR');
Despite this, the message "WooCommerce Translation Available" still exists, and the WooCommerce interface is still in English. How to make WooCommerce switch to French?
The "Force Update Translation" translation procedure (from the message) is not executed:
Failed to install / update the translation: an authentication error occurred while updating the translation. Try again or adjust your update constants.
I am using a new installation of WordPress 4.0 (French release) and WooCommerce 2.2.4.
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