added Extend modules for Hindi, Urdu, Mongolian

src/hindi/AllHin.gf

@@ -2,5 +2,5 @@
 
 concrete AllHin of AllHinAbs =
   LangHin,
-  ExtraHin
-  ** {} ;
+  ExtendHin
+  ** open ExtraHin in {} ;

src/hindi/AllHinAbs.gf

@@ -1,4 +1,4 @@
 abstract AllHinAbs =
   Lang,
-  ExtraHinAbs
+  Extend
   ** {} ;

src/hindi/ExtendHin.gf

@@ -0,0 +1,11 @@
+--# -path=.:../common:../abstract
+
+concrete ExtendHin of Extend =
+  CatHin ** ExtendFunctor -
+  [
+    ComplDirectVQ, ComplDirectVS
+   ]
+  with
+    (Grammar = GrammarHin) ** {
+
+}