- doc/first_steps/usb_installation to doc/first_steps/installation
  - doc/first_steps/usb_reset doc/first_steps/reset
  - doc/first_steps/usb_reset/linux doc/first_steps/reset/linux
  - doc/first_steps/usb_reset/windows doc/first_steps/reset/windows
  - doc/first_steps/usb_upgrade doc/first_steps/upgrade
  - doc/first_steps/manual_usb_installation doc/first_steps/installation/manual
  - doc/first_steps/manual_usb_installation/linux doc/first_steps/installation/manual/linux
  - doc/first_steps/manual_usb_installation/windows doc/first_steps/installation/manual/windows
  - doc/first_steps/manual_usb_installation/mac doc/first_steps/installation/manual/mac
  - contribute/design/usb_installation contribute/design/installation

  - 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

So they are not repeated in the PO files.

Prefixing the `cat` command with `sudo` is problematic. Using `dd`
solves this issue.

- Move device name warning at the end of step 2
- Capitalize GNOME
- Use USB stick instead of USB drive or USB key
- Use pseudo-docbook markup
- Remove screenshots or replace them by plain-text
- Use "Terminal" as a proper noun instead of "the Terminal" for Mac
- Use "tip" markup for optional information
- Do not use contractions like "you're"
- Harmonize the Mac and Linux documentation

This reverts commit 7ff0a002.