Dear Jos,
yes, you are correct, it would be certainly a benefit to use tools such as Transifex, Pootle or something similar in order to allow the participation of other persons.
BTW, these tweets refer to auto-translatations that were done using publicly available translations services. The translation packages were generated with our tools, the auto-translation of the PO files was done with a little script and public translation services.
Thanks for the hint!
best regards
Alexander Kläser