bts-link was code by Pierre Habouzit. This tool helps to track better the changes made in remotes bug tracking system, where had been forwarded bugs from the Debian BTS.
You can read the announcement of this new tool in d-d-announce.
Using bts-link with the KDE bugzilla
To forward bugs from the Debian BTS, you only need to forward the bug to the KDE bugzilla:
forwarded XXXXXX https://bugs.kde.org/show_bug.cgi?id=YYYYYYY
Where XXXXXX is the Debian bug number and YYYYY the kde bug number.