Current version is WT3 available at translator.openttd.org
WebTranslator is a DHTML interface that was used for the translations before WebTranslator3 was created. It allowed translators to translate and publish without the need of using SVN.
The old WebTranslator2 website is found here. You can not use it for translating anymore. The current status of the language files could be seen here.
Take a look at the screenshot to the right, or go find others.