Stop spamming the watchdog log with "Automatically checked 0 translations, updated 0."

I agree that it could be improved, but I don't agree on the category. But thanks for the notice, I will make this more usefull in D8.

I would like to express my support for this change. Please make this a setting or don't log anything when both values are 0.

Don't count on a setting. Design for the 80%. i.e. No report when nothing happens. But D8 is first and I expect others to step-up for the backport of minor items like these.
That said, changing priority to minor.

You mean that you'll make this change when a patch is supplied?

I refer to Drupal 8 core development I'm working on #1191488: META: Integrate l10n_update functionality in core. Yes, if a patch is supplied, I will review and consider committing it. And I also disable the module when the sit is in production.

It would be better from a performance perspective if l10n_update_cron checked the current time against the frequency before doing anything, but that requires a new variable to hold the last update time. D6 (sorry) patch attached that does that as well as only doing the watchdog if one or both of the numbers is non-zero.

+++ l10n_update.module	(working copy)
@@ -95,10 +95,15 @@
 function l10n_update_cron() {
-  if ($frequency = variable_get('l10n_update_check_frequency', 0)) {
+  $last = variable_get('l10n_update_last_check', 0);
+  $frequency = variable_get('l10n_update_check_frequency', 0) * 24 *3600;

Don't use time(), use REQUEST_TIME instead.

Patch modified and committed.