Merge remote-tracking branch 'origin/devel' into devel

config/chroot_local-includes/usr/local/lib/tails-shell-library/tails-greeter.sh

@@ -6,7 +6,7 @@ PHYSICAL_SECURITY_SETTINGS='/var/lib/live/config/tails.physical_security'
 _get_tg_setting() {
     if [ -r "${1}" ]; then
         . "${1}"
-        eval "echo \$${2}"
+        eval "echo \${${2}:-}"
     fi
 }
 

wiki/src/support/known_issues.mdwn

@@ -560,3 +560,14 @@ GeForce GTX 960.
 
 This problem will likely be resolved once Tails
 [[!tails_ticket 10298 desc="includes a newer Linux kernel"]].
+
+Tor Browser does not support MPEG-4 videos
+------------------------------------------
+
+Tor Browser does not support MPEG-4 video streaming in Tails 2.0 and
+newer. Instead, in some cases you can download them and play them with
+the video player included in Tails.
+
+On the other hand, web sites that propose WebM video streaming work fine.
+
+See [[!tails_ticket 10835]] for more details.