add bulgarian language (still incomplete)

lib/resource/bulgarian/SentenceBul.gf

@@ -0,0 +1,29 @@
+concrete SentenceBul of Sentence = CatBul ** open Prelude, ResBul in {
+
+  flags optimize=all_subs ;
+
+  lin
+    PredVP np vp = mkClause (np.s ! Nom) np.a vp ;
+
+    ImpVP vp = {
+      s = \\p,i => 
+        let gn : GenNum =
+              case i of {
+                ImpF _  True => GPl ;
+                ImpF Sg _    => GSg (variants {Masc; Fem; Neut}) ;
+	        ImpF Pl _    => GPl
+	      } ;
+            agr = {gn = gn ; p = P2} ;
+            verb = vp.imp ! p ! numImp i ;
+            compl = vp.s2 ! agr
+        in
+        verb ++ compl
+    } ;
+
+    UseCl t a p cl = {
+      s = t.s ++ a.s ++ p.s ++ cl.s ! t.t ! a.a ! p.p ! ODir
+    } ;
+    UseQCl t a p cl = {
+      s = \\q => t.s ++ a.s ++ p.s ++ cl.s ! t.t ! a.a ! p.p ! q
+    } ;
+}