Correction des différents bugs

app/Nova/Contest.php

@@ -67,7 +67,7 @@ class Contest extends Resource
                 })
                 ->disableDownload(),
             URL::make('URL')->readonly(),
-            Date::make('Fin')->readonly()->sortable(),
+            Date::make('Fin')->sortable(),
             Text::make('Tweet ID', 'tweetid')->hideFromIndex()->readonly(),
             Text::make('Nb Tweet', 'nbtweet')->readonly(),
         ];