Integrate TBB localization patch into the Greeter proper

I just noticed that I erroneously merged feature/tor-browser-bundle, while it still has a crude config/chroot_local-patches/browser-localization.patch. This should be integrated into Tails Greeter in time for 1.2.

Parent Task: #7953 (closed)

Original created by @intrigeri on 8032 (Redmine)

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