missing syntax functions in Chi and some other languages

lib/src/dutch/NounDut.gf

@@ -39,6 +39,11 @@ concrete NounDut of Noun = CatDut ** open ResDut, Prelude in {
       a = np.a
       } ;
 
+    ExtAdvNP np adv = heavyNP {
+      s = \\c => np.s ! c ++ embedInCommas adv.s ;
+      a = np.a
+      } ;
+
     DetQuantOrd quant num ord = 
       let 
         n = num.n ;