Function make_simple_label_cs 

pub fn make_simple_label_cs(
    text: &str,
    font_name: &str,
    font_size: f64,
    cs: Charset,
) -> TextLabelLayout

make_simple_label for a graph of charset cs. C scans bytes; with charset=big5 a byte in 0xA1..=0xFE takes the next byte with it, so that byte is never an escape.