Redoing the mainpage

For the moment that's too expensive in CPU processing. We need to concentrate on the message first, and whenever we have CPU and disk IO in abundance, we can think of making that type of statistics available. As we are assuming that translators do not have the main page as entry point, we mainly focus the main page contents to those yet unknown with translatewiki.

P.s. feel free to make textual changes, and well ones will stay in as long as they are concise and on topic :)