As far as I know it's not always the case. Servers are updated with some delays. One available indicator - version number. You could compare it with latest changes in SVN to see difference.
Well, sure, that is why I've said "(almost)". But, IIANM, the syncing is done quite routinely. Anyway, if I may ask, I would prefer not making a list called "i18n" turn into a "sync-notification" list. If you need that (and if it is not already somewhere else, which is also quite possible), ask for another list, please.
-- [[cs:User:Mormegil | Petr Kadlec]]