WP_PHPMailer::SetLanguage( $langcode = 'en',  $lang_path = '' ): true

Source

public function SetLanguage( $langcode = 'en', $lang_path = '' ) {
	$error_strings  = array(
		'authenticate'         => __( 'SMTP Error: Could not authenticate.' ),
		'buggy_php'            => sprintf(
			/* translators: 1: mail.add_x_header. 2: php.ini */
			__(
				'Your version of PHP is affected by a bug that may result in corrupted messages. To fix it, switch to sending using SMTP, disable the %1$s option in your %2$s, or switch to MacOS or Linux, or upgrade your PHP version.'
			),
			'mail.add_x_header',
			'php.ini'
		),
		'connect_host'         => __( 'SMTP Error: Could not connect to SMTP host.' ),
		'data_not_accepted'    => __( 'SMTP Error: data not accepted.' ),
		'empty_message'        => __( 'Message body empty' ),
		/* translators: There is a space after the colon. */
		'encoding'             => __( 'Unknown encoding: ' ),
		/* translators: There is a space after the colon. */
		'execute'              => __( 'Could not execute: ' ),
		/* translators: There is a space after the colon. */
		'extension_missing'    => __( 'Extension missing: ' ),
		/* translators: There is a space after the colon. */
		'file_access'          => __( 'Could not access file: ' ),
		/* translators: There is a space after the colon. */
		'file_open'            => __( 'File Error: Could not open file: ' ),
		/* translators: There is a space after the colon. */
		'from_failed'          => __( 'The following From address failed: ' ),
		'instantiate'          => __( 'Could not instantiate mail function.' ),
		/* translators: There is a space after the colon. */
		'invalid_address'      => __( 'Invalid address: ' ),
		'invalid_header'       => __( 'Invalid header name or value' ),
		/* translators: There is a space after the colon. */
		'invalid_hostentry'    => __( 'Invalid hostentry: ' ),
		/* translators: There is a space after the colon. */
		'invalid_host'         => __( 'Invalid host: ' ),
		/* translators: There is a space at the beginning. */
		'mailer_not_supported' => __( ' mailer is not supported.' ),
		'provide_address'      => __( 'You must provide at least one recipient email address.' ),
		/* translators: There is a space after the colon. */
		'recipients_failed'    => __( 'SMTP Error: The following recipients failed: ' ),
		/* translators: There is a space after the colon. */
		'signing'              => __( 'Signing Error: ' ),
		/* translators: There is a space after the colon. */
		'smtp_code'            => __( 'SMTP code: ' ),
		/* translators: There is a space after the colon. */
		'smtp_code_ex'         => __( 'Additional SMTP info: ' ),
		'smtp_connect_failed'  => __( 'SMTP connect() failed.' ),
		/* translators: There is a space after the colon. */
		'smtp_detail'          => __( 'Detail: ' ),
		/* translators: There is a space after the colon. */
		'smtp_error'           => __( 'SMTP server error: ' ),
		/* translators: There is a space after the colon. */
		'variable_set'         => __( 'Cannot set or reset variable: ' ),
	);
	$this->language = $error_strings;
	return true;
}

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