Add explicit character encoding specifications in 39 more RGL modules

To silence warnings and avoid potential problems after changing the default
encoding to UTF-8.

lib/src/romanian/BeschRon.gf

@@ -1,3 +1,4 @@
+--# -coding=latin1
 resource BeschRon = open Prelude, MorphoRon,CatRon in {
 
 flags optimize=noexpand ;