Why is the variation "For Ze Frrensh" considered comical? Why is this variation put in place of "Poor lay Zanglay" in the English version of Exercises in Style?

The variation "For Ze Frrensh" is considered comical because it tells the story in a stereotypical French accent as understood by English-speakers. This variation is put in place of "Poor lay Zanglay" in the English version of Exercises in Style because the translation of "Poor lay Zanglay" would not be understood or enjoyed by readers.