Trad: Add language spanish (argentina)

htdocs/langs/es_AR/help.lang

htdocs/langs/es_AR/install.lang

htdocs/langs/es_AR/interventions.lang

htdocs/langs/es_AR/languages.lang

htdocs/langs/es_AR/ldap.lang

htdocs/langs/es_AR/mails.lang

htdocs/langs/es_AR/main.lang

htdocs/langs/es_AR/members.lang

htdocs/langs/es_AR/orders.lang

htdocs/langs/es_AR/oscommerce.lang

htdocs/langs/es_AR/other.lang

htdocs/langs/es_AR/products.lang

htdocs/langs/es_AR/projects.lang

htdocs/langs/es_AR/propal.lang

htdocs/langs/es_AR/sendings.lang

htdocs/langs/es_AR/shop.lang

htdocs/langs/es_AR/stocks.lang

htdocs/langs/es_AR/suppliers.lang

htdocs/langs/es_AR/trips.lang

htdocs/langs/es_AR/users.lang