Allow accents in names

app/inc/constants.php.template

@@ -58,7 +58,7 @@ $ALLOWED_LANGUAGES = [
 // Regex
 const POLL_REGEX = '/^[a-z0-9]+$/';
 const CHOICE_REGEX = '/^[012]$/';
-const NAME_REGEX = '/^[ a-z0-9_ -]+$/i';
+const NAME_REGEX = '/(*UTF8)^[[:alnum:]_ -]+$/i';
 
 // Path to logo
 const LOGOBANDEAU = '<relative path to the logo file>';