Actually the Brits did not invent concentration camps. Spain used them in the Ten Years War.
So far Argentina, Austria-Hungary, Bosnia, Britian, Cambodia, Canada, Chile, Croatia, Finland, France, Germany, Italy, China, Poland, the Soviet Union, Serbia, Slovakia, Netherlands, North Korea, and the United States have all used them, and in some cases continue to do so.
As far as nationalistic tunes... eh, whatever. Even high schools have fight songs. Never heard a single one from anywhere that glorified the camps... closest I can think of is Borat's "Throw the Jew Down the Well"... and that's HBO comedy.