French translation and translation issues

[benji1000]

Hello,

great plugin :) here is the translation file for French. To be placed in a translation.php file within a new folder fr_FR inside the Locale folder of the plugin, for those who do not want to wait for an update.

<?php
return array(
  'Email subject' => 'Sujet de l\'email',
  'Duration in days' => 'Durée en jours',
  'Send a task by email to creator' => 'Envoyer une tâche par email au créateur',
  'Send a task by email to assignee' => 'Envoyer une tâche par email à la personne assignée',
  'Send email notification of impending due date' => 'Envoyer une notification par email lorsque l\'échéance de la tâche se produit',
  'Send email notification of impending subtask due date' => 'Envoyer une notification par email lorsque l\'échéance de la sous-tâche se produit',
  'Include Task Title and ID in subject line?' => 'Inclure le titre et l\'identifiant de la tâche dans le sujet',
  'Send new comments on a task by email' => 'Envoyer les commentaires d\'une tâche par email',
);

Also, please note that the Portuguese, Italian and Russian translations are missing the Include Task Title and ID in subject line? string, and that all translations except the Italian one are missing the Send new comments on a task by email string.