Added the initialisation of the user language at registration time.

When the user register, we grab the language from the browser and use it
as first value for the corresponding user object. The user can then
later on modify it from his account area.

src/IDF/Form/RegisterConfirmation.php

@@ -63,6 +63,7 @@ class IDF_Form_RegisterConfirmation extends Pluf_Form
                                                        'size' => 15,
                                                                     ),
                                             ));
+
         $this->fields['password'] = new Pluf_Form_Field_Varchar(
                                       array('required' => true,
                                             'label' => __('Your password'),