Aren't they just records in a database? Assuming Localize has a scalable architecture, it shouldn't be too hard to support sites with little traffic and few phrases.
So it was: User types stuff.. stuff goes in a database... a translator gets notified that there is new work.. and he would do it and insert back into the database.. which would eventually make it out to a site.
Google translate style is OK for google results, but not for a professional website.