artfulweb
Here is the complete French language pack with all the admin and catalog french language files, the Paypal app in French (includes/app/paypal/language), the installation directory all in French plus the translated READ ME file.
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Voici le pack complet en français avec tous les fichiers pour les répertoires admin et catalog en françaiss, l'app Paypal en français (includes/app/paypal/language), le répertoire d'installation tout en français plus le fichier READ ME traduit.

Features

Ultimate SEO URL rewrites the standard Phoenix URLs to make them more user friendly and with multi-language support.

Products URLs can be composed with any combination of product, category, manufacturer or model names in any order. It can be changed and the old URL will redirect to the new one.

For example if you choose category/brand/model/product-name and if the uri type is path based your product url will look like:
instead of the regular:
Multilanguage and SEO

It also adds the ability to differentiate URLs by language, creating different URL addresses for each one, something crucial if you want your pages to be indexed correctly by browsers depending on its target language.

Stock Phoenix returns the same URI for all the language localized versions of a page. This app will make them different pages, i.e.:

Default language (i.e. English): www.mysite.com/green-tomatoes-p-6.html
Second language (i.e. Spanish): www.mysite.com/es/tomates-verdes-p-6.html
Third language (i.e. French): www.mysite.com/fr/tomates-vertes-p-6.html

Note default language will not include the language path (/en/, /es/, /fr/, /de/...)

Canonical and hreflang tags

The app also includes canonical and hreflang modules that add differentiating tags to these pages. This highly improves Phoenix SEO capabilities for multi-lingual shops.

With the canonical tags Info pages will be linked to their corresponding .php file, avoiding the spiders finding duplicated content, i.e.;

www.mysite.com/info.php?pages_id=1

will become

www.mysite.com/privacy-cookie-policy-pi-1.html

and both canonical tags on these pages will point to

www.mysite.com/privacy.php

as the default URL for the same content.

With hreflang tags each page will contain links of other localized versions of itself:

English <link rel="alternate" hreflang="en" href="http://www.mysite.com/my-great-category-c-3.html" />
German <link rel="alternate" hreflang="de" href="http://www.mysite.com/de/meine-super-kategorie-c-3.html" />
Spanish <link rel="alternate" hreflang="es" href="http://www.mysite.com/es/mi-estupenda-c ... a-c-3.html" />

Cache

It also has the ability to cache URLs, using three methods: File, SQLite or Mysql based. This will improve the page generation times by saving database queries, specially on sites with lots of products and categories or servers with low resources.

404 error page

You can personalize your "404 Not found" page. The template is located at: /templates/default/includes/pages/notfound_404.php. It will return correct 404 header unlike stock one does.

Sitemap

Included in this package is a sitemap generator compatible with multiple languages. It will generate separate sitemaps for products, categories and other pages. To generate the sitemap you must access /sitemaps/index.php directory of your website. This task can be automated if you wish.

This addon adds the ability to set a special price and expiry date directly from the product-editor, instead of setting it on specials.php.
This is particularily useful if you have a lot of products, and the dropdown on specials.php is getting annoying.
The specials still show up on specials.php, so you can still easily manage the products you already have on discount.

##For earlier versions##
If you are on a version prior to 1.0.5.9, you can still install this addon, using version 1.1, but you will need to insert a hook-call at admin/categories.php (line 617 on 1.0.5.0):

<?php
echo $OSCOM_Hooks->call('categories', 'injectDataForm');
?>

This call is added in core from 1.0.5.9 and later, so it's fine to add to an earlier version, and will not be overwritten by an update, if you update to at least 1.0.5.9.
The layout might be off, but if you look at the other input-boxes in categories.php, you might be able to figure out how to ammend includes/hooks/admin/categories/productSpecials.php accordingly

To install upload everything beside this file to the coresponding directories at the server.
NOTE! All files go to the includes of the root directory, and not the admin/includes!
Copy and translate the English language-file as needed.

Credit goes to the PhoenixCart core-developers for making it possible to install without modifying core.