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fix(frontend): ensure country list respects RTL languages DEV-841 (#5875)

## 📣 Summary
Ensure countries list is displayed in the correct direction for RTL
languages.

## 📖 Description
This adjusts `getCountryDisplayString` so that when the UI language is
RTL (like Arabic or Hebrew), the countries list respects the reading
order, improving the UX for RTL users.

No functional changes outside the display of the countries string.

## 👷 Description for instance maintainers
No database or deployment changes. Pure frontend utility fix.

## 💭 Notes
* Couldn't fully run the local Docker frontend due to platform + Docker
daemon issues on ARM Mac, but linting, unit tests, and code review of
the minimal change look solid.
* Happy to adjust or add any follow-up if maintainers suggest
improvements.

## 👀 Preview steps
*(didn't run full manual UI preview locally due to setup blockers —
trusting maintainers to validate UI or have CI e2e handle it)*

Expected:
* **Before:** RTL users saw `Country1, Country2, Country3` always in LTR
order.
* **After:** `getCountryDisplayString` respects RTL when `currentLang()`
is an RTL language.

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