fix: Add error message localization and fix JSON translation syntax

- Fixed missing commas in Spanish translation files (es-MX.json, es-CL.json)
- Fixed JSON structure issues in en-US.json
- Added comprehensive error message keys for all HTTP error types
- Enhanced ErrorHandlerInterceptor to support Fineract userMessageGlobalisationCode
- Implemented proper i18n translation for error alerts (401, 403, 404, 500, 501)

Author: saksham869