Jewish heirs of Holocaust victims and their representatives have filed two lawsuits in California staking their claims to Nazi-looted paintings that still hang on the walls of prominent museums in Los Angeles and Auschwitz.The two lawsuits are the first to be filed after the recent passage of laws by California and Congress, which strengthen U.S.-based claims to artworks that were forcibly taken from Jewish families during World War II.One lawsuit was filed in Los Angeles Superior Court on Monday by the Jewish Federation of Greater Los Angeles and its board chair Daniel Gryczman against Norton Simon Museum in Pasadena for...