The Associated PressTHE IDEAL: The European Union was built on a grand vision of free labor markets in which talent could be matched with demand in a seamless and efficient manner. THE REALITY: Today only 3 percent of working age EU citizens live in a different EU country. One study says language is the biggest barrier to cross-border mobility in Europe. HARD FOR THE YOUNG: As young people in crisis-hit southern Europe face unemployment rates hovering at 50 percent, many find themselves caught in a language trap. They are unable to communicate in the powerhouse economy that needs their skills the most: Germany.