Wales is part of the United Kingdom and shares the Island of Great Britain with England and Scotland. But this small country has a distinctive personality that sets it apart from its better-know neighbors.   The prevalence of the Welsh language, from road signs to café menus, alongside English, is proof of the country’s enduring heritage. So is the country’s cuisine, which is heavy on seafood, lamb and leek soup.   Wales also has more castles per square mile than any other country in Europe....