mw.cx.TargetArticle.prototype.publishFail = function ( errorCode, messageOrFailObjOrData, data, jqXHR ) {
	// ...

	// Event logging
	mw.hook( 'mw.cx.translation.publish.error' ).fire(
		this.sourceLanguage,
		this.targetLanguage,
		this.sourceTitle,
		this.getTargetTitle(),
		data
	);

        // ...

	const editResult = data.edit;
	// Handle captcha
	// Captcha "errors" usually aren't errors. We simply don't know about them ahead of time,
	// so we save once, then (if required) we get an error with a captcha back and try again after
	// the user solved the captcha.
	if ( editResult && editResult.captcha && (
		editResult.captcha.type === 'image' ||
		editResult.captcha.type === 'simple' ||
		editResult.captcha.type === 'math' ||
		editResult.captcha.type === 'question'
	) ) {
		this.loadCaptchaDialog().then( this.showErrorCaptcha.bind( this, editResult ) );
		return;
	}

	// ...
};

// Event logging
mw.hook( 'mw.cx.translation.publish.error' ).fire(
	this.sourceLanguage,
	this.targetLanguage,
	this.sourceTitle,
	this.getTargetTitle(),
	data
);

const editError = data.error;
if ( editError ) {
	this.handleEditError( editError );
	return;
}

// Handle (other) unknown and/or unrecoverable errors
this.showErrorUnknown( editResult, data, jqXHR );