Merge remote-tracking branch 'origin/master' into testing

Conflicts:
	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