Well, we obviously can't add all the languages in the world to
`ediff-diff-ok-lines-regexp', but we can run diff in a known
environment.

Any comments?  Is this the best way to do this sort of stuff?  The
LOCALE/LANGUAGE/LC_* variables can be kinda confusing.

diff --git a/lisp/vc/ediff-diff.el b/lisp/vc/ediff-diff.el
index adb6ce8053..38c546729e 100644
--- a/lisp/vc/ediff-diff.el
+++ b/lisp/vc/ediff-diff.el
@@ -1146,7 +1146,10 @@ ediff-exec-process
 	 (if (string-match "buffer" (symbol-name ediff-job-name))
 	     ediff-coding-system-for-write
 	   ediff-coding-system-for-read))
-	args)
+        (process-environment
+         ;; Avoid localization of messages so we can parse the output.
+         (cons "LC_MESSAGES=C" process-environment))
+        args)
     (setq args (append (split-string options)
                        (mapcar (lambda (file)
                                  (when (stringp file)


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