Correctly handle public uploads in activities

Fix #104
[tx-robot] updated from transifex
[tx-robot] updated from transifex
Use user display name and file names unescaped in emails

We send emails with mimetype plain/text so that should not be a problem

Fix #136
Merge pull request #135 from owncloud/issue/104

Correctly handle public uploads in activities
Merge pull request #137 from owncloud/issue/136

Use user display name and file names unescaped in emails
Merge branch 'master' into stable7

* master:
  Use user display name and file names unescaped in emails
  [tx-robot] updated from transifex
  [tx-robot] updated from transifex
  Correctly handle public uploads in activities