With a great help from clope, gengo 2.5 alpha 2 is out, and you can download it from its download page on WordPress.org (get ‘development version’). This release is almost working, I’m testing it live on several websites, including Pixline as well, but still use at your own risk.
Last changes include:

better terms/tags/category dealing: [40724], [43374] (props clope)
language box fixed [...]