Copyright for language-selector source package in Kinetic

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/

Files: *
Copyright: 2005-2021, Canonical Ltd
License: GPL-2+

Files: debian/*
Copyright: 2009, Harald Sitter 
           2005-2021, Canonical Ltd
License: GPL-2+

License: GPL-2+
 On Debian systems, the complete text of the GNU General
 Public License can be found in `/usr/share/common-licenses/GPL-2'.