The Mercurial repository is hosted on Bitbucket.
Before filing any new bug track, take a look if it hasn't been already signaled.
Please report every information needed to reproduce the error. Remember to include:
Patches can also be submitted to the mailing list (see below).
The account on Transifex is used to coordinate the translation effort.
The mailing list is open also to non-subscribers (anyone can send emails) but is moderated by default: your first message needs to be approved; if it's on-topic, the succeeding ones will be automatically accepted.