Languages of the European Union which is understood by 51% of all adults, while German is the most widely used mother tongue, spoken by 18%. All 24 official languages of the EU are accepted as working languages, but in practice only two – English and French – are in wide general use and of these English is the more commonly used. French is an official language in all three of the cities that are political centres of the Union: Brussels (Belgium), Strasbourg (France) and Luxembourg City (Luxembourg). , the official languages of the European Union, as stipulated in the latest amendment of "Regulation No 1
European institutions in Strasbourg The Audiovisual Observatory and the Institute for Human Rights are the only institutions in the quarter to have moved into pre-existing premises: a 1900 villa and an 18th-century former postal relay station and inn turned conventual building, respectively. The Arte headquarters, previously disseminated on several buildings across the town, were united in a single spacious building close to the Louise Weiss building in 2003. November 2007 saw the extension of the Strasbourg tramway into the European Quarter, with the inauguration by European Parliament president Hans-Gert Pöttering, CoE Secretary general Terry Davis and Eurocorps Lieutenant General Pedro Pitarch of the "Parlement