Sending e-mails with UTF-8 content

[pes-soft]

If any content in e-mail notifications include special UTF-8 characters, these are not sent correctly as PHPMailer's default charset is iso-8859-1. It is possible to fix sending in UTF-8 by adding $this->_mailer->CharSet = 'UTF-8'; before calling $this->_mailer->Send() within lib/Mailer.php in send function.

For backward compatibility, this feature/fix could be also enabled/disabled by configuration variable.