Added language flags to bronzeage grammars.

examples/bronzeage/BronzeageRus.gf

@@ -1,5 +1,7 @@
 --# -path=.:present:prelude
 
 concrete BronzeageRus of Bronzeage = CatRus, SwadeshRus ** BronzeageI with
-  (Lang = LangRus) ;
+  (Lang = LangRus) ** {
+  flags language = ru_RU;
+}