We don't guess the current profile anymore if the value of the profile === -1
Also sets $this->scoped for all ScopingNoticeStream inheritors, which just
like in an Action can be null if we're not scoped in any way (logged in).
L10n/i18n updates.
Superfluous whitespace removed.
Add FIXME for a few i18n issues I couldn't solve this quickly.
Takes care of documentation for all core code added in merge of "people tags" feature (Commit:e75c9988ebe33822e493ac225859bc593ff9b855).