Add language chooser to sidebar.
Use a dropdown instead of rendering each flag. Although it doesn't look as nice when there are only two or three options to choose from, it: * Works well with lots of translations. * Falls back gracefully when the relevant icon is not found. It redirects the browser via JS as soon as a new language is chosen. When JS is disabled, it falls back to showing a "Change" button, which in concert with a `.htaccess` `mod_rewrite` rule, takes incoming `lang=fr` query parameters and rewrites them to `/fr/...` Icons are from the https://github.com/googlei18n/region-flags/blob/gh-pages/COPYING project, which subsequently took them from Wikipedia and confirmed they are in the public domain.
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