Makor overhaul of the French language pack

Deleted 9 files (should probably be made available in some kind of
legacy environment somewhere):
- addons_lang
- blogger_api_lang
- bystrom_pagination_lang
- clickstats_lang
- edit_lang
- help_lang
- mt_import_lang
- publish_lang
- upload_lang

Translated 8 new files never translated before:
- expressionengine_info_lang
- fieldtypes_lang
- file_lang
- publish_tabs_custom_lang
- rte_lang
- safecracker_lang
- updated_sites_lang
- xmlrpc_lang

Added back to the French language files all untranslated items found in
the English language files.

Corrected numerous translations in all files.

All files saved as UTF8 with no BOM, LF endings.

Enjoy!
Some more changes: plural forms

Changed some translations regarding templates (modèles) and members
(membres)
Added back "addons_lang.php" + other fixes

Added back "addons_lang.php" + other minor fixes regarding the words
"champs/champ"
Other fixes

Other fixes
Final changes and corrections

* re-checked the plural forms :
- groupe de champ => groupe de champs
- groupe de catégorie => groupe de catégories
- groupe de membre => groupe de membres
- groupe de statut => groupe de statuts

*Thoroughly checked the nav and the menus
- shortened some terms
- translated closer to the English version
- improved the translation in regard with "File/Files/File manager" :
came back with an issue on one English file

*Tried to keep the same translation across the CP despite the English
wording being different in some case
Merge branch 'master' of git://github.com/ebeauchamps/EE-Language-French closes #5

Conflicts:
	french/wiki_lang.php