Standardize UK country code to 'gb'

[CodeVishal-17]

Pull Request

Description

This PR standardizes the UK country code to gb across the application, as requested in #66.

A previous PR (#69) addressed this change but was closed without being merged, so this PR reapplies the fix cleanly with a minimal diff. The change updates the default country value, related conditionals, and documentation strings to ensure consistency.

Fixes #66

How Has This Been Tested?

This change updates default configuration values and conditionals only.

The application was verified to run without syntax or runtime errors, and no existing functionality was modified. No additional automated tests were added, as the change does not introduce new logic or behavior.

• Yes

If your changes affect data processing, have you plotted any changes? i.e. have you done a quick sanity check?

• Yes

Checklist:

• My code follows OCF's coding style guidelines
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked my code and corrected any misspellings