[Web]: Update flags to reflect user location, not currency

[ssandino]

Is your feature request related to a problem? Please describe.

Currently, the flag in the navigation is linked to the currency, which can be confusing since flags are typically associated with locations. Additionally, displaying the user’s own country flag helps build trust.

Current Status:
Flag linked to currency. Since we only support three currencies, there are currently only three flags displayed.

Describe the solution/feature

The goal is to link the flag to the user’s location, which is determined in the middleware. Based on this information, the appropriate country flag will be displayed.

This approach will remain independent of the current setup where all users outside Switzerland are routed to the International page (.../int/...). This routing behavior should not change.

Describe alternatives you've considered

No response

Criteria for Completion

No response

Anything else?

No response

Code of Conduct

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