I think the SO team should add localization to the main http://stackoverflow.com website, whereby if a browsers locale is set to
es and the user posts a question, it will get submitted to the database with the
es locale (maybe some quick lookup to an online translator to verify that the language matches the browser locale).
English questions are submitted with
en by default and are displayed on browsers with the
By default, only questions/answers with the locale flag that matches a users browser will be displayed to that user, and their could be a button that says
this question is available in another language.
In the user options, one should also be able to set additional
locale flags to display questions in any language they wish as long as they're logged in.
Lastly, there should also be the ability to "translate" questions into multiple locals, and earn rep &/ badges for doing so.
Proposal: Stack Ovserflow in Spanish