Get i18n rolling again

[kghbln]

This extension used to be supported by twn, however this is years ago. I will be nice to have it again.

[JeroenDeDauw]

I'd honestly not bother for just the extension description.

[kghbln]

Not a front burner given that we already have heaps of translations. However having this is the difference between a good and a very good extension.