Add new mail footers to template files.

[micbar]

Fixes owncloud/enterprise#2788

Expected behaviour

Mails from the activity app should contain the new mail footer with "imprint" and "privacy policy" links.

Html Footer

<?php print_unescaped($this->inc('html.mail.footer', ['app' => 'core'])); ?>

Plain Text Footer

<?php print_unescaped($this->inc('plain.mail.footer', ['app' => 'core'])); ?>

What happens instead

The footer is missing.

Activity app didn't follow up with this change.

[codecov-io]

Codecov Report

Merging #639 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #639   +/-   ##
=========================================
  Coverage     86.56%   86.56%           
  Complexity      495      495           
=========================================
  Files            36       36           
  Lines          1787     1787           
=========================================
  Hits           1547     1547           
  Misses          240      240

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[PVince81]

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