Hostgator has a security feature that automatically bans any script that is requested to often and returns a status code of 403 or forbidden for the script in question.
Our translation script appears to have been caught up in the Hostgator security feature, effectively shutting down all the language translations for the store.
We have asked Hostgator to remove the restriction and now the script is working again. There is no way to know in advance if the script will be shut down again.
We are currently thinking of having one script per language, instead of one script for all languages, effectively reducing the load in on script by a factor of 10. If our script is shut down again, we will then implement this fix.
Please feel free to contact us with any questions you may have.