Display an error message when there is no column for a project

locales/fr_FR/translations.php

@@ -180,4 +180,5 @@ return array(
     '%d closed tasks' => '%d tâches terminées',
     'no task for this project' => 'aucune tâche pour ce projet',
     'Public link' => 'Accès public',
+    'There is no column in your project!' => 'Il n\'y a aucune colonne dans votre projet !',
 );

locales/pl_PL/translations.php

@@ -180,4 +180,8 @@ return array(
     '%d closed tasks' => '%d zamkniętych zadań',
     'no task for this project' => 'brak zadań dla tego projektu',
     'Public link' => 'Link publiczny',
+
+    /* Missing translations:
+    'There is no column in your project!' => '',
+    */
 );