A simple multi language solution?

Hello

I am in need of creating a multi-language site but I can’t seem to find what I am looking for. Either I stumble upon automatic translators or just some sort of fancy flag switches which are just switches which require some additional plugins and so on. Can’t this be made simple?

Some general info:

1. I speak fluently in all the languages I need, so no need for (often clumsy) translator.
2. I know how to create a multisite WordPress install.

Is there a theme or a plugin which creates identical posts simultaneously? So let’s assume I type in the English WordPress ‘site’. The exact post in English, together with photos also appears in the Spanish version. Then I just replace the English text with the Spanish text without the need to change image links or upload duplicate images to the media library etc.

I would like a language selector in the header area and not footer or widget as I might use some full-width template which has no side widgets.

I think this idea is simple and straightforward but I can’t seem to find a solution. You know, I need to make sure the layout is exactly the same so whenever I change an image or add a page I want this to be reflected in all versions of the website (all WP sites). I just need to have the further ability to edit the content…

Thanks.