Add support for the ISO 8601 date format (for due date)

locales/es_ES/translations.php

@@ -289,4 +289,5 @@ return array(
     // 'Nothing found.' => '',
     // 'Search in the project "%s"' => '',
     // 'Due date' => '',
+    // 'Others formats accepted: %s and %s' => '',
 );

locales/fr_FR/translations.php

@@ -289,4 +289,5 @@ return array(
     'Nothing found.' => 'Rien trouvé.',
     'Search in the project "%s"' => 'Rechercher dans le projet « %s »',
     'Due date' => 'Date d\'échéance',
+    'Others formats accepted: %s and %s' => 'Autres formats acceptés : %s et %s',
 );

locales/pl_PL/translations.php

@@ -294,4 +294,5 @@ return array(
     // 'Nothing found.' => '',
     // 'Search in the project "%s"' => '',
     // 'Due date' => '',
+    // 'Others formats accepted: %s and %s' => '',
 );

locales/pt_BR/translations.php

@@ -290,4 +290,5 @@ return array(
     // 'Nothing found.' => '',
     // 'Search in the project "%s"' => '',
     // 'Due date' => '',
+    // 'Others formats accepted: %s and %s' => '',
 );