Postage function with paypal

Oops, I’m re-openning this thread because after multiple tests, I see now that the problem come from languages. If I pay by paypal in English, the postage is set, but in French, it’s not.

I absolutely don’t know where to begin to solve that. I show you my config.php but I don’t know if it is related to…

// Settings
c::set('license', 'put your license key here');
c::set('panel.language', 'fr');
c::set('debug',true);
c::set('cache.ignore', array('cart',));
c::set('email.service', 'mail');

// Sitemap plugin
c::set('sitemap.images.license', 'http://creativecommons.org/licenses/by-nc-nd/4.0/');
c::set('sitemap.include.images', true);
c::set('sitemap.include.invisible', false);
c::set('sitemap.ignored.pages', ['informations']);
c::set('sitemap.ignored.templates', ['contact', 'projets']);
c::set('sitemap.frequency', true);
c::set('sitemap.priority', true);

// Languages
c::set('languages', array(
  array(
    'code'    => 'fr',
    'name'    => 'French',
    'locale'  => 'fr_FR',  
    'default' => true,
    'url'     => '/',
    'locale'  => array(
      LC_COLLATE  => 'fr_FR.utf8',
      LC_MONETARY => 'fr_FR.utf8',
      LC_NUMERIC  => 'fr_FR.utf8',
      LC_TIME     => 'fr_FR.utf8',
      LC_MESSAGES => 'fr_FR.utf8',
      LC_CTYPE    => 'fr_FR.utf8'
    )
  ),
  array(
    'code'    => 'en',
    'name'    => 'English',
    'locale'  => 'en_US',
    'url'     => '/en',
    'locale'  => array(
      LC_COLLATE  => 'en_US.utf8',
      LC_MONETARY => 'en_US.utf8',
      LC_NUMERIC  => 'en_US.utf8',
      LC_TIME     => 'en_US.utf8',
      LC_MESSAGES => 'en_US.utf8',
      LC_CTYPE    => 'en_US.utf8'
    )
  )
));

/*
---------------------------------------
User roles
--------------------------------------

*/

c::set('roles', array(
  array(
    'id'      => 'client',
    'name'    => 'Client',
    'default' => true,
    'panel'   => false
  ),
  array(
    'id'      => 'admin',
    'name'    => 'Admin',
    'panel'   => true
  )
));


/*

---------------------------------------
Routes
--------------------------------------

*/

c::set('routes', array(
  array(
    'pattern' => 'logout',
    'action'  => function() {
      if($user = site()->user()) $user->logout();
      go('login');
    }
  )
));