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.

src/french/NumeralFre.gf

@@ -1,3 +1,4 @@
+--# -coding=latin1
 concrete NumeralFre of Numeral = CatFre [Numeral,Digits] ** 
   open CommonRomance, ResRomance, MorphoFre, Prelude in {