The Brexit debate in the UK is focusing on the rights of EU migrants in the country, among them about 300,000 Germans. Many people are worried about what will happen to them after Brexit. But how are the 100,000 Brits in Germany feeling? The BBC's Damien McGuinness says many are hurrying to apply for citizenship."So, when are you becoming German?" It's one of those questions that always seems to crop up when I'm chatting to British friends here in Berlin these days. Most are either applying for German citizenship or counting the days until they've spent enough time here to be eligible....