updated for version 7.3.198

Problem:    No completion for ":lang".
Solution:   Get locales to complete from. (Dominique Pelle)

src/vim.h

@@ -779,6 +779,7 @@ extern char *(*dyn_libintl_textdomain)(const char *domainname);
 #define EXPAND_FILETYPE		37
 #define EXPAND_FILES_IN_PATH	38
 #define EXPAND_OWNSYNTAX	39
+#define EXPAND_LOCALES		40
 
 /* Values for exmode_active (0 is no exmode) */
 #define EXMODE_NORMAL		1