add cp1252. usefull for Swedish and German

src/GF/Text/Coding.hs

@@ -2,13 +2,16 @@ module GF.Text.Coding where
 
 import GF.Text.UTF8
 import GF.Text.CP1251
+import GF.Text.CP1252
 
 encodeUnicode e = case e of
   "utf8"   -> encodeUTF8
   "cp1251" -> encodeCP1251
+  "cp1252" -> decodeCP1252
   _        -> id
 
 decodeUnicode e = case e of
   "utf8"   -> decodeUTF8
   "cp1251" -> decodeCP1251
+  "cp1252" -> decodeCP1252
   _        -> id