patch 8.2.1269: language and locale code spread out

Problem:    Language and locale code spread out.
Solution:   Move relevant code to src/locale.c. (Yegappan Lakshmanan,
            closes #6509)
diff --git a/src/Make_mvc.mak b/src/Make_mvc.mak
index 65d530f..3b72001 100644
--- a/src/Make_mvc.mak
+++ b/src/Make_mvc.mak
@@ -773,6 +773,7 @@
 	$(OUTDIR)\insexpand.obj \
 	$(OUTDIR)\json.obj \
 	$(OUTDIR)\list.obj \
+	$(OUTDIR)\locale.obj \
 	$(OUTDIR)\main.obj \
 	$(OUTDIR)\map.obj \
 	$(OUTDIR)\mark.obj \
@@ -1669,6 +1670,8 @@
 
 $(OUTDIR)/list.obj:	$(OUTDIR) list.c  $(INCL)
 
+$(OUTDIR)/locale.obj:	$(OUTDIR) locale.c  $(INCL)
+
 $(OUTDIR)/main.obj:	$(OUTDIR) main.c  $(INCL) $(CUI_INCL)
 
 $(OUTDIR)/map.obj:	$(OUTDIR) map.c  $(INCL)
@@ -1939,6 +1942,7 @@
 	proto/insexpand.pro \
 	proto/json.pro \
 	proto/list.pro \
+	proto/locale.pro \
 	proto/main.pro \
 	proto/map.pro \
 	proto/mark.pro \