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Magnan Jules 5f4efacea2 Add Upper and Lower Silesia flags (#2771)
Resolves #2755
https://github.com/openfrontio/OpenFrontIO/issues/2755

## Description:

Add flags of Upper Silesia and Lower Silesia. Added both regions in
`resources/countries.json` and both SVG flags.

- [ ] I have added screenshots for all UI updates
- [ ] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [ ] I have added relevant tests to the test directory
- [ ] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

jeunemage333

<img width="609" height="69" alt="image"
src="https://github.com/user-attachments/assets/d223642f-f133-4e7b-a811-83a4e6b9cfe5"
/>
<img width="1910" height="980" alt="image"
src="https://github.com/user-attachments/assets/0c7b7a6c-358a-4879-9991-ef540688d790"
/>
<img width="609" height="69" alt="image"
src="https://github.com/user-attachments/assets/4b322b08-96f6-4059-a84c-cddce1eb94b7"
/>
2026-01-02 16:16:47 -08:00
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