Don't use CommonX because the bulgarian CAdv category differ from the common one. The new CAdv definition is added

lib/resource/bulgarian/TextBul.gf

@@ -0,0 +1,11 @@
+concrete TextBul of Text = CatBul ** {
+
+-- This will work for almost all languages except Spanish.
+
+  lin
+    TEmpty = {s = []} ;
+    TFullStop x xs = {s = x.s ++ "." ++ xs.s} ;
+    TQuestMark x xs = {s = x.s ++ "?" ++ xs.s} ;
+    TExclMark x xs = {s = x.s ++ "!" ++ xs.s} ;
+
+}