Header 1,Header 2,Header 3,Header 4 GOOD_MORNING,"Good Morning","Guten Morgen","Bonjour" GOOD_EVENING,"Good Evening","","""""" Without quotes,"With, comma","With ""inner"" quotes","With ""inner"", quotes"","" and comma","With ""inner split"" quotes and line breaks","With \nnewline chars" Some other~delimiter~should still work, shouldn't it? What about tab separated lines, good?
