Discussion:
http://stackoverflow.com/questions/21656785/troubles-with-changing-the-font-size-in-uitableviewheaderfooterview

Helpful answer:
http://stackoverflow.com/a/28488181/471673

In essence:
“You could implement tableView:willDisplayHeaderView and change the font in kind of this way:”
- (void)tableView:(UITableView *)tableView willDisplayHeaderView:(UIView *)view forSection:(NSInteger)section
{
UITableViewHeaderFooterView *headerView = (UITableViewHeaderFooterView *)view;
headerView.textLabel.font = ...;
}

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