Escape display name

	private function addNewUserToLDAP(string $displayName, string $recoveryEmail, string $username, string $userEmail, string $password): void {

		$connection = $this->LDAPConnectionService->getLDAPConnection();

		$base = $this->LDAPConnectionService->getLDAPBaseUsers()[0];

		$newUserDN = "username=$username," . $base;

		$displayName = htmlspecialchars($displayName);

		$quota = $this->getDefaultQuota() * 1024 * 1024;

		$newUserEntry = [