kde-l10n-si fails to install due to /usr/share/locale/si/LC_MESSAGES/kcmcolors.mo being in plasma-desktop-data as well

[Karl-Philipp Richter]

`sudo apt-get install kde-l10n-si` fails with

    Reading package lists... Done
    Building dependency tree
    Reading state information... Done
    The following NEW packages will be installed:
      kde-l10n-si
    0 upgraded, 1 newly installed, 0 to remove and 4 not upgraded.
    Need to get 0 B/545 kB of archives.
    After this operation, 2.899 kB of additional disk space will be used.
    (Reading database ... 689039 files and directories currently installed.)
    Preparing to unpack .../kde-l10n-si_4%3a4.10.97-0ubuntu1_all.deb ...
    Unpacking kde-l10n-si (4:4.10.97-0ubuntu1) ...
    dpkg: error processing archive /var/cache/apt/archives/kde-l10n-si_4%3a4.10.97-0ubuntu1_all.deb (--unpack):
     trying to overwrite '/usr/share/locale/si/LC_MESSAGES/kcmcolors.mo', which is also in package plasma-desktop-data 4:5.4.2-0ubuntu2
    dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
    Errors were encountered while processing:
     /var/cache/apt/archives/kde-l10n-si_4%3a4.10.97-0ubuntu1_all.deb
    E: Sub-process /usr/bin/dpkg returned an error code (1)

Maybe related: https://bugs.launchpad.net/ubuntu/+source/kde-l10n-si/+bug/1460444

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: kde-l10n-si (not installed)
Uname: Linux 4.3.3-040303-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Jan 18 12:48:30 2016
InstallationDate: Installed on 2015-12-12 (36 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: kde-l10n-si
UpgradeStatus: No upgrade log present (probably fresh install)