here are the base texts: (downloaded with distribute.sh)
http://files.[ simutrans [dot] us (site down, do not visit) ]/files/get/hGPuEwpWU0/language-pack-basetexts.zip
I have no idea how to wget the files for pak64. Creating the *.tab files for each language seems to work.Building the zip with wget seems to work, also building tab files alone. But the page itself is screwed.
edit: here are the tab files for pak64:
http://files.[ simutrans [dot] us (site down, do not visit) ]/files/get/wk03goR_Pg/pak64-language-files.zip
The archive also contains a bash script, which can be modified to get the language files for other pak-sets too. It downloads each .tab file alone, since I could not figure out how the zip-file is named on the translator-page.