Added routes to the router for list pages in single-user mode.
For each of the actions in those routes, use the global single-user
nickname rather than a nickname URL argument to determine the tagger ID.
In nav, and for Ajax, provide the right nicknames.
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).