The User Side
In the overview you get a list of newest language packages.
If you goto details you get the details and a button to download the language package.
If download is not working the users can notify website owner about broken package.
If a language package is not available for the moment the users can send a request to website owner.
In the main menu you can see a list of all languages for which a language package is available.
You can also show the list of languages in current wgTransifex module.
You can also show the list of project currently existing in Transifex.