hot list: show full page of posts even with sticky
Subreddit settings API: add sticky_permalink
Gold messages: update wordings
locate_static_file: Reverse search order.

This makes plugin static files more consistent with other parts of the
plugin system where the ordering of g.plugins is meaningful.
Add full gettext support to the frontend.

This replaces r.strings with a new i18n system based on Jed. Messages
are extracted from the JS source directly. Plurals are supported as
well.

The string formatting built into r.strings is now moved onto
String.prototype.