0.40 feature freeze has been announced, so translators can now start translating.
See also https://groups.google.com/forum/#!topic/corsix-th-dev/01D4gBZwcD4
For translators that do not want to work with git, the following is probably useful to know (copied from the above google group thread):
I know for many translators git can be intimidating. If you have completed a translation but do not want to use git you can paste the file in this mailing list with a clear subject like "0.40 translation - Russian" and we'll make sure it ends up in the right place.