Seomra ranga - "classroom", in Ireland's indigenous language - reads a cardboard sign tacked onto a door. A little further down the hall, a leabharlann is filled with books. It is a very Irish scene, but in a very unlikely place: East Belfast Mission on Newtownards Road. Across the street, a mural commemorates the Protestant paramilitary Ulster Volunteer Force. Union Jack flags fly from lampposts in the shadow of the shipyards that built the Titanic.