Add Brittany flag for breton (br) language

[YoruNoHikage]

Hello, here's the flag for Brittany, home of the Breton language which code is br currently being falsely displayed with Brazil flag.

From what I understand the flags folder contains the files named after country codes which would explains why Brazil is chosen instead. It makes sense for pt-BR, but not for br nor br-FR.

Since this might need a deeper rework in the code, I'm not sure where to introduce changes to make it work.
It is probably related to #1352.

[coderabbitai]

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