By Kameron Duncan The NFL continues to expand internationally with games in different countries. This season, the league played games in two different European cities – London, England and Frankfurt, Germany – and it could be planning on heading to other cities. According to Ben Fischer of Sports Business Journal, the league’s owners are set to vote on a measure that could add up to four more games to the international slate per season. The league has played games in Mexico and Canada in the past, and if the new measure is approved, those locales could return in addition to new games in Brazil…