Add language support for getCatalogedErrorMessage

[ziyadonji]

🌍 Overview

This PR adds support for language parameters in the message catalog manager, enabling error messages to be displayed in the user's preferred language. This is part of a larger multi-language support initiative across the AppConnect platform.

📋 Summary

• Type: Feature Enhancement
• Impact: Non-breaking change (fully backward compatible)

🎯 Motivation

Currently, all error messages are displayed in English regardless of the user's language preference. This PR enables the system to:

1. Accept language parameters from upstream services
2. Look up messages in language-specific catalogs
3. Fall back to English if translations are unavailable
4. Maintain full backward compatibility with existing implementations

📝 Changes Made

1. Updated lib/middleware/errorMiddleware.js

Added optional language parameter to formattingMiddleware() function:

// Before
function formattingMiddleware(catalogIndex, preProcessorFunction)

// After
function formattingMiddleware(catalogIndex, preProcessorFunction, language)

Changes:

• Added language parameter (optional, defaults to 'en')
• Pass language to getCatalogedErrorMessage() method

Usage Example:

const middleware = formattingMiddleware(
    catalogIndex,
    preprocessor,
    'fr'  // French
);

2. Updated lib/message-catalog-manager.js

Added optional language parameter to getCatalogedErrorMessage() method:

// Before
MessageCatalogManager.prototype.getCatalogedErrorMessage = function (catalogedError)

// After
MessageCatalogManager.prototype.getCatalogedErrorMessage = function (catalogedError, language)

Changes:

• Added language parameter (optional, defaults to 'en')
• Pass language through to getMessage() method

Note: The existing getMessage() method already supported language parameters, so no changes were needed there.

[mattbaileyuk]

Thanks for the contribution; could you please add at least one test showing this behaviour so we can avoid regressing it later.

[ziyadonji]

@mattbaileyuk, Added tests, please have a look again. Thanks.