Added typeName function to PgObject as it might be useful for building generic functions.

pglablib/catalog/PgLanguage.cpp

@@ -9,3 +9,8 @@ QString PgLanguage::dropSql() const
 {
 	throw std::exception("PgLanguage::dropSql() not implemented");
 }
+
+QString PgLanguage::typeName() const
+{
+	return "LANGUAGE";
+}