correcting fixUTF8 with composer! Not tested on a web-server !

public/traitementEnvoiLienVeilleTinternet.php

@@ -68,7 +68,7 @@ function extractText($message)
 /**************************************************************************************************************/
 /******************* TEST COTÉ SERVEUR POUR L'ENVOI DU MESSAGE    *********************************************/
 
-$message = Encoding::fixUTF8(StringCompat::protectionDoubleQuote(StringCompat::protectionSimpleQuote($_POST['message'])));
+$message = ForceUTF8\Encoding::fixUTF8(StringCompat::protectionDoubleQuote(StringCompat::protectionSimpleQuote($_POST['message'])));
 
 if (passValide($_POST['password']) && $_POST['message'] != "") {