patch 8.0.1773: dialog messages are not translated

Problem:    Dialog messages are not translated.
Solution:   Add N_() and _() where needed. (Sergey Alyoshin)
diff --git a/src/po/Make_mvc.mak b/src/po/Make_mvc.mak
index 0f0adeb..0748bdf 100644
--- a/src/po/Make_mvc.mak
+++ b/src/po/Make_mvc.mak
@@ -119,7 +119,7 @@
 all: $(MOFILES)
 
 files:
-	$(LS) $(LSFLAGS) ..\*.c ..\if_perl.xs ..\GvimExt\gvimext.cpp ..\globals.h ..\if_py_both.h > .\files
+	$(LS) $(LSFLAGS) ..\*.c ..\if_perl.xs ..\GvimExt\gvimext.cpp ..\globals.h ..\if_py_both.h ..\vim.h > .\files
 
 first_time: files
 	set OLD_PO_FILE_INPUT=yes