Create local homepage for TBB
check.torproject.org is unmaintained and overloaded (see #6156 (closed)). We've rate-limited the version check, but we still need a homepage for our browser to use instead.
We've got the work from #3749 (moved) (see http://jmtodaro.com/tor/check/success.html), but it's way too busy and overloaded with text for a homepage. We should remove the infoboxes, most of the text, and the footer. In fact, I think the only thing we should keep is the portion of that page up to and including the search box (which should point to StartPage, not DDG).
We also need to use DTD strings from Torbutton rather that flat-text (for translation).