Bug#930587: release-notes: fails to build for jessie and stretch

[Wenbin Lv <wenbin816@gmail.com>]

Package: release-notes
Severity: serious
Tags: ftbfs
Justification: fails to build from source (but built successfully in the past)

Recent transition from .dbk to .po for the ca language leaves some
untracked .dbk files in the source directory and causes git checkout of
jessie and stretch to fail in the build system of the Debian website,
showing the following errors[1]:

rebuilding the release notes for {jessie,stretch}
error: The following untracked working tree files would be overwritten by checkout:
	ca/about.dbk
	ca/installing.dbk
	ca/issues.dbk
	ca/moreinfo.dbk
	ca/old-stuff.dbk
	ca/release-notes.dbk
	ca/upgrading.dbk
	ca/whats-new.dbk

which causes buster version of the release notes to be built for jessie
and stretch[2][3].

Please remove the untracked files to fix the issue.

[1] https://www-master.debian.org/build-logs/webwml/release-notes.log
[2] https://www.debian.org/releases/jessie/amd64/release-notes/index.en.html
[3] https://www.debian.org/releases/stretch/amd64/release-notes/index.en.html

-- System Information:
Debian Release: 10.0
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: mipsel

Kernel: Linux 4.19.0-5-amd64 (SMP w/2 CPU cores)
Locale: LANG=zh_CN.UTF-8, LC_CTYPE=zh_CN.UTF-8 (charmap=UTF-8), LANGUAGE=zh_CN:zh (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled