By: Addison Wylie If you can bear with Don Jon’s vulgar vocabulary, you may find yourself swept up in Joseph Gordon-Levitt’s directorial debut.  It’s a modern day romance with just the right dash of sweet and salty. Gordon-Levitt plays the title character, a guido with a heart who loves to spend time with his boys, work out, and scope out chicks.  At the end of the day, he likes to come home and watch a…