Thanks, Vira and Nemo, those are both the correct links to the project on translatewiki.
Some initial documentation has been started on Meta:
Feel free to add to it if you start using the tool! We hope to have better materials available when we do a more public launch.
Vojtěch, we haven't received that specific feedback, but we're still in the beta period.
I would encourage anyone to continue to give feedback. In particular, we had identified some instances that represent important test cases (as I recall, we mentioned Armenian Wiktionary because of active WikiCamps and tracking activity on a non-Wikipedia wiki; RTL languages to make sure it works in all languages; etc.). At its core, we need the tool to be multi-wiki and multilingual.
Best,
Tighe