* unarchive: fix non-english locales
For GNU Gettext, the LANGUAGE environment variable takes precedence over LANG or LC_ALL. On systems where LANGUAGE was set to a non-english locale, the output of the tar command therefore not understood and the module failed silently ("changed": false, but the archive was not extracted).
* add tests
* changelog
(cherry picked from commit 49e1cb9)
Co-authored-by: Jonathan Neuhauser <jonathan.hofinger@gmx.de>
Co-authored-by: Jonathan Neuhauser <jonathan.hofinger@gmx.de>