check in winfe changes for Vietnamese cp1258 work . Thanks Van Le from the net

cmd/winfe/mozilla.rc

@@ -3121,6 +3121,7 @@ BEGIN
     IDS_LANGUAGE_VIETNAMESE_VPS     "Vietnamese (VPS)"
     IDS_LANGUAGE_VIETNAMESE_TCVN    "Vietnamese (TCVN)"
     IDS_LANGUAGE_VIETNAMESE_VNI     "Vietnamese (VNI)"
+    IDS_LANGUAGE_VIETNAMESE_CP1258  "Vietnamese (Windows-1258)"
 END
 
 STRINGTABLE DISCARDABLE 

cmd/winfe/resource.h

@@ -3479,6 +3479,7 @@
 #define IDS_LANGUAGE_VIETNAMESE_VPS     62123
 #define IDS_LANGUAGE_VIETNAMESE_TCVN    62124
 #define IDS_LANGUAGE_VIETNAMESE_VNI     62125
+#define IDS_LANGUAGE_VIETNAMESE_CP1258  62126
 #define IDS_LANGUAGE_LATIN1             62130
 #define IDS_LANGUAGE_JAPANESE           62131
 #define IDS_LANGUAGE_LATIN2             62132