- Rename Tails installer into Tails Installer
  - Say Tails Installer instead of the Tails Installer
  - Talk about "USB stick or SD card", or "Tails device"
  - Device must be of at least 4 GB
  - Mention that installation does not secure delete old data

Conflicts:
	wiki/src/doc/first_steps.index.fr.po
	wiki/src/doc/first_steps/bug_reporting/tails_does_not_start.de.po
	wiki/src/doc/first_steps/bug_reporting/tails_does_not_start.es.po
	wiki/src/doc/first_steps/bug_reporting/tails_does_not_start.fr.po
	wiki/src/doc/first_steps/bug_reporting/tails_does_not_start.pt.po
	wiki/src/doc/first_steps/persistence/configure.de.po
	wiki/src/doc/first_steps/persistence/configure.es.po
	wiki/src/doc/first_steps/persistence/configure.pt.po
	wiki/src/doc/first_steps/usb_installation.de.po
	wiki/src/doc/first_steps/usb_installation.es.po
	wiki/src/doc/first_steps/usb_installation.fr.po
	wiki/src/doc/first_steps/usb_installation.pt.po
	wiki/src/doc/first_steps/usb_upgrade.de.po
	wiki/src/doc/first_steps/usb_upgrade.es.po
	wiki/src/doc/first_steps/usb_upgrade.fr.po
	wiki/src/doc/first_steps/usb_upgrade.pt.po

Conflicts:
	wiki/src/doc/first_steps.index.de.po
	wiki/src/doc/first_steps.index.es.po
	wiki/src/doc/first_steps.index.fr.po
	wiki/src/doc/first_steps.index.pt.po
	wiki/src/doc/first_steps/introduction_to_gnome_and_the_tails_desktop.de.po
	wiki/src/doc/first_steps/introduction_to_gnome_and_the_tails_desktop.es.po
	wiki/src/doc/first_steps/introduction_to_gnome_and_the_tails_desktop.fr.po
	wiki/src/doc/first_steps/introduction_to_gnome_and_the_tails_desktop.pt.po
	wiki/src/support/found_a_problem.fr.po
	wiki/src/support/known_issues.de.po
	wiki/src/support/known_issues.es.po
	wiki/src/support/known_issues.fr.po
	wiki/src/support/known_issues.pt.po

This reverts commit 0a762639.

Since some applications do run under another user than 'amnesia' and
more privileges are required to see other users processes, the use of
VM.spawn which executes commands in the VM as root is necessary over the
use of VM.execute (which executes commands as 'amnesia').