[ticket/12113] Allow log entries to use plurals

PHPBB3-12113
[ticket/12113] Correctly use plurals when deleting user warnings

PHPBB3-12113
[ticket/12113] Fix view_log() tests

PHPBB3-12113
Merge remote-tracking branch 'github-nickvergessen/ticket/12113' into develop-ascraeus

* github-nickvergessen/ticket/12113:
  [ticket/12113] Fix view_log() tests
  [ticket/12113] Correctly use plurals when deleting user warnings
  [ticket/12113] Allow log entries to use plurals