I am very happy to notice a flurry of translation work going on around the OSGeo4W and MapServer projects recently!
On the MapServer front, Lars Lingner started a German translation of the website about a year ago, which led to some work on the website structure to support multiple languages, and a first release of the German translation on the mapserver.org website a few weeks ago.
Since then, Eduin Carillo and Juanma M. R. have started with the Spanish translation, and a few days ago, Yves Jacolin volunteered to work on the French translation. I should add that Yves already offers a good number of French translations through his website for MapServer, GDAL, QGIS, GRASS, etc. The Spanish and French versions of the MapServer website are not published yet, but we can expect them to go live in the near future.
On the OSGeo4W front, the translation effort started with a Japanese translation of the installer by Jeff McKenna and a team of partners in Japan. This required a good amount of ground work to allow support for multiple languages in the installer and the website, and now that the bases are there with the Japanese translation, Yves Jacolin just showed up again to drop some French bits.
Thanks to all the translation contributors for their hard work. If you are interested in contributing to those translation efforts please do not hesitate to join the fun, here are some guidelines for MapServer and for OSGeo4W. In all cases, the developers list of your favorite project is the best place to share your intentions and/or ask for help getting started.
Update: Thomas Gratier just announced on mapserver-dev his plan to contribute to the French translation of MapServer docs. Merci Thomas!