[david927]

A market isn't a language. (And by the way, a "quality OS" that only supports English is a bit of an oxymoron.)

The EU has no internal borders; it is a single market on a single currency.

[jrmg]

That's not actually true. It's [arguably] a single market, but it's not a single currency - large parts of the EU do not use the Euro (Britain, Sweden, Denmark and all of the newer entrants to name a few - it's only I use by 16 of the 27 member states).