PHPMailer::setLanguage PHP Method

    public function setLanguage($langcode = 'en', $lang_path = '')
    {
        // Backwards compatibility for renamed language codes
        $renamed_langcodes = array('br' => 'pt_br', 'cz' => 'cs', 'dk' => 'da', 'no' => 'nb', 'se' => 'sv');
        if (isset($renamed_langcodes[$langcode])) {
            $langcode = $renamed_langcodes[$langcode];
        }
        // Define full set of translatable strings in English
        $PHPMAILER_LANG = array('authenticate' => 'SMTP Error: Could not authenticate.', 'connect_host' => 'SMTP Error: Could not connect to SMTP host.', 'data_not_accepted' => 'SMTP Error: data not accepted.', 'empty_message' => 'Message body empty', 'encoding' => 'Unknown encoding: ', 'execute' => 'Could not execute: ', 'file_access' => 'Could not access file: ', 'file_open' => 'File Error: Could not open file: ', 'from_failed' => 'The following From address failed: ', 'instantiate' => 'Could not instantiate mail function.', 'invalid_address' => 'Invalid address: ', 'mailer_not_supported' => ' mailer is not supported.', 'provide_address' => 'You must provide at least one recipient email address.', 'recipients_failed' => 'SMTP Error: The following recipients failed: ', 'signing' => 'Signing Error: ', 'smtp_connect_failed' => 'SMTP connect() failed.', 'smtp_error' => 'SMTP server error: ', 'variable_set' => 'Cannot set or reset variable: ', 'extension_missing' => 'Extension missing: ');
        if (empty($lang_path)) {
            // Calculate an absolute path so it can work if CWD is not here
            $lang_path = dirname(__FILE__) . DIRECTORY_SEPARATOR . 'language' . DIRECTORY_SEPARATOR;
        }
        //Validate $langcode
        if (!preg_match('/^[a-z]{2}(?:_[a-zA-Z]{2})?$/', $langcode)) {
            $langcode = 'en';
        }
        $foundlang = true;
        $lang_file = $lang_path . 'phpmailer.lang-' . $langcode . '.php';
        // There is no English translation file
        if ($langcode != 'en') {
            // Make sure language file path is readable
            if (!is_readable($lang_file)) {
                $foundlang = false;
            } else {
                // Overwrite language-specific strings.
                // This way we'll never have missing translation keys.
                $foundlang = (include $lang_file);
            }
        }
        $this->language = $PHPMAILER_LANG;
        return (bool) $foundlang;
        // Returns false if language not found
    }

 /**
  * Inner mailer initialization from set variables
  *
  * @return void
  */
 protected function initMailFromSet()
 {
     $this->mail->setLanguage($this->get('langLocale'), $this->get('langPath'));
     $this->mail->CharSet = $this->get('charset');
     $this->mail->From = $this->get('from');
     $this->mail->FromName = $this->get('fromName') ?: $this->get('from');
     $this->mail->Sender = $this->get('from');
     $this->mail->clearAllRecipients();
     $this->mail->clearAttachments();
     $this->mail->clearCustomHeaders();
     $emails = explode(static::MAIL_SEPARATOR, $this->get('to'));
     foreach ($emails as $email) {
         $this->mail->addAddress($email);
     }
     $this->mail->Subject = $this->get('subject');
     $this->mail->AltBody = $this->createAltBody($this->get('body'));
     $this->mail->Body = $this->get('body');
     // add custom headers
     foreach ($this->get('customHeaders') as $header) {
         $this->mail->addCustomHeader($header);
     }
     if (is_array($this->get('images'))) {
         foreach ($this->get('images') as $image) {
             // Append to $attachment array
             $this->mail->addEmbeddedImage($image['path'], $image['name'] . '@mail.lc', $image['name'], 'base64', $image['mime']);
         }
     }
 }