A matter of language...

web/index.php

 
 require_once('model/classes.php');
 
-//header("Content-Type:application/json");
+header("Content-Type:application/json");
 
 if(!empty($_GET['page'])) {
   if($_GET['page'] == "palmares") {

web/view/palmares.php

 	$scArray = array();
 	for($i = 0; $i < sizeof($scores); $i++) {
 		array_push($scArray, array(
-			"login" => $scores[$i]->getLogin(),
+			"login" => utf8_encode($scores[$i]->getLogin()),
 			"score" => $scores[$i]->getScore()
 		));
-		echo json_encode($scArray);
 	}
 }catch(Exception $e) {
 	echo json_encode(array("erreur" => $e->getMessage()));