The dxGetText installer available from SourceForge has been quite outdated for a while. Via this StackOverflow answer I got this link, where somebody actually went through the trouble to update the tools and create a new installer for them. He also provides the sources he used for the tools. I hope they are based on a recent version of the ones in the SVN repository.
Thanks Dr. Jürgen Rathlev for taking the time!
(Note: I haven’t yet tried them)