Fix english:add-commas

src/lang/english.rkt

@@ -98,7 +98,7 @@
         (foldl
           (lambda (x result)
             (append result (list ", " x)))
-          (car lst)
+          (list (car lst))
           (drop-right (cdr lst) 1))
         (list ", and " (last lst)))
     )))