link changed
link the calendar in "about - what's next" (#7075)
RAM empties itself even without safe erasure (#8156)
updated PO files
Update alpha channel 1.2 upgrade-description file for the new 1.2_to_1.2.1 IUK.

The old one lacked critically importat Tor Browser files due to a bug
in the IUK generation code, fixed in tails-iuk commit 6b89b81.
Use a /etc/apt/preferences.d-compatible name.
Link to the jenkins-jobs repo, and to the j-j-b homepage.