Update for phpmailer.lang-sr.php (#1049)
Update for phpmailer.lang-sr.php (#1049)

Added and fixed missing translation.
Use this one, please.
pingyen/PHPMailer,nawawi/PHPMailer,ravisorg/PHPMailer,jimjag/PHPMailer,Synchro/PHPMailer,PHPMailer/PHPMailer,nawawi/PHPMailer,jimjag/PHPMailer,pingyen/PHPMailer,Synchro/PHPMailer,PHPMailer/PHPMailer,ravisorg/PHPMailer