Betawiki is doing a great job on the localisation of extensions. This can be deduced from the improvement shown by the group statistics and from the increasing list of extensions that are supported.
Today Siebrand provided another interesting statistic; a list with the extensions that have some localisation in more then fifty languages. This list is already quite long and it is interesting to note that the BoardVote has already some support from 111 languages.
There is one little teaser in this mix, Siebrand only included the extensions that use "$messages". This excluded the one extension that is my favourite, the Wikidata extension.. Then I again I was told that it is somewhere int the eighties :)