Merge branch 'FS#2751' of git://github.com/splitbrain/dokuwiki into pull-request-245

* 'FS#2751' of git://github.com/splitbrain/dokuwiki:
  coding corrections. correct type hint, remove unused variable assignment
  de/de-informal: localization updates (delete user function)
  unit tests for self deleting of user accounts
  FS#2751 - self deletion of user account