[Tails-l10n] (review)[de] Tails installer: Linux

Hi,
here the pages for installing with Linux ready to review. I also
included another file with some small edit's (for unified translation).

Please review:

https://gitlab.com/spriver/tails.git
branch: de_install_linux
HEAD commit: 1d7f836 Unified translation

Affected files:
wiki/src/install/linux/clone/overview.de.po
wiki/src/install/linux/usb.de.po
wiki/src/install/linux/usb/overview.de.po

wiki/src/doc/first_steps/installation/manual/linux.de.po


Cheers!
spriver