As schools citywide open their doors today, a group critical of a new Arabic-language public school is stepping up its opposition efforts, broadening its campaign to target national school curricula.The group, a coalition of community members, parents, and organizations called Citizens for American Values in Public Education, is seeking to stop the national use of textbooks that address Middle Eastern studies in ways the group says are too narrowly focused on Islamic culture. The coalition is an outgrowth of the group Stop the Madrassa, which has strongly opposed the creation of an Arabic-language school in Brooklyn, the Khalil Gibran International...