Just trying to get my head around the idea here and had a few questions;

You're looking at multiple languages contained within a single site. Are you looking to use an online translator or were these hand typed languages?

Would it not be better to have 5 separate sites with the country extensions so that you could get exposure in 5 different search engine markets in native language, and just have a link from each page to the others with the different languages?

It still means more edits, but I'm looking at it from an SEO angle rather than the user angle.