apt show gibberish in package description

[Marco van Zwetselaar]

I am not sure whether to report this bug against apt, the vim-snipmate package, or as a translation bug. It seems to be located in the en_GB translation of the package description for vim-snipmate.

On my Ubuntu Vivid (locale en_GB) the output of "apt show vim-snipmate" contains this section:

--- snip ---
 for (i = 0; i < count; i++) {
 .
 Project-Id-Version: ddtp-ubuntu
 Report-Msgid-Bugs-To: FULL NAME <EMAIL@ADDRESS>
 POT-Creation-Date: 2014-09-03 08:41+0200
 PO-Revision-Date: 2014-05-06 13:30+0000
 Last-Translator: FULL NAME <EMAIL@ADDRESS>
 Language-Team: English (United Kingdom) <email address hidden>
 MIME-Version: 1.0
 Content-Type: text/plain; charset=UTF-8
 Content-Transfer-Encoding: 8bit
 X-Launchpad-Export-Date: 2014-09-04 23:31+0000
 X-Generator: Launchpad (build 17196)
 .
 To go to the next item in the loop, simply <tab> over to it; if there is
--- snip ---

The middle part starting with "Project-Id-Version" upto "X-Generator" doesn't belong here. I have checked and it isn't present in the "DEBIAN/control" file in vim-snipmate_0.87-2_all.deb. Instead the control file contains the expected single '}' character at that location.

Grepping through /var/lib/apt I have found the injected bit in the vim-snipmate description in
/var/lib/apt/lists/partial/tz.archive.ubuntu.com_ubuntu_dists_vivid_universe_i18n_Translation-en%5fGB.bz2
It is not present in the vim-snipmate description in
/var/lib/apt/lists/partial/tz.archive.ubuntu.com_ubuntu_dists_vivid_universe_i18n_Translation-en.bz

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: apt 1.0.9.7ubuntu4.1
ProcVersionSignature: Ubuntu 3.19.0-30.34-generic 3.19.8-ckt6
Uname: Linux 3.19.0-30-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.17.2-0ubuntu1.5
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Oct 9 15:01:02 2015
InstallationDate: Installed on 2013-09-28 (740 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
SourcePackage: apt
UpgradeStatus: Upgraded to vivid on 2015-05-27 (135 days ago)