Quick fixes for a couple small things checked in and installed. Tomos' reported problem: * broken caching with Internet Explorer (OutputPage::sendCacheControl()) vary: accept-encoding replaced with vary: user-agent to keep IE from refusing to cache pages Related problem I noticed while fixing that: * compressed pages from the file cache were being resent every time because IE tacked some size info on its response that broke the timestamp comparison (OutputPage::checkLastModified()) Menchi's reported problem: * missing language links on edit previews and special pages with Nostalgia skin (SkinNostalgia::doBeforeContent()) -- brion vibber (brion @ pobox.com)