The chant that Cartman leads down the street of the town literally translates to, "It is time for revenge!" "We need to exterminate the Jews!"
Stan says that he saw the movie "Baseketball" and demanded a refund. Matt Stone and Trey Parker starred in BASEketball (1998)
While Kyle is viewing the film, the characters in the film are speaking German, rather than Aramaic.
Cartman and the townfolk's German dialog translates to English as "Es ist Zeit für Säuberung", which means "it's time for a cleanse". and "Wir müssen die Juden ausrotten", which means "We must exterminate the Jews" and "Es ist Zeit für Rache!" which means "It's time for revenge!" The syntax and pronunciation are so poor though that actual Germans have a hard time understanding it.
When Cartman is wearing the Hitler costume, you can see the Swastika flag except there is no Swastika symbol.