ContentBlock: do not repeat yourself
UserBlock: make block ID more visible (big + strong combo)
BAC-536: make block ID more viisble

* add AfterFormatPermissionsErrorMessage hook in OutputPage::formatPermissionsErrorMessage() method
Merge pull request #1074 from Wikia/bac-536-show-block-id

BAC-536: Phalanx - make block ID more visible when blocked