Remove unreachable statement
Load avatar in header via PHP

* fix #7484
* use UID, css, and div instead of span
add avatardiv-shown class to bring back mobile style
Merge pull request #11751 from owncloud/fix-unreachable-statement

Remove unreachable statement
Merge pull request #7749 from owncloud/load_avatar_header_via_php

Load avatar in header via PHP
[tx-robot] updated from transifex
adding missing email address for principal

* fix #8515
* add mail only if it exists