This pull request introduces backend configuration improvements and adds significant new functionality for managing "Contact Checks" in the frontend, including internationalization support for related UI strings in both English and Spanish. The most important changes are grouped below:

Backend and Environment Configuration:

• Added the FRONTEND_PUBLIC_URL environment variable to ngen.base.env, ngen.dev.env.example, and ngen.prod.env.example to support generating frontend links in emails and other integrations. [1] [2] [3]

Frontend Functionality: Contact Check API Integration:

• Introduced a new service module contactchecks.jsx with API functions for CRUD operations, resending, confirming, and retrieving Contact Checks, including error handling and alert notifications.

Internationalization:

• Added and updated a comprehensive set of English and Spanish translation strings in translation.json files to support the new Contact Check features and improve UI feedback, including new button labels, status messages, and detailed field descriptions. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12]