I took over a community website that had a government requirement to be bilingual. The previous webmaster had tried different solutions that didn't work. After seeing the reviews here on JED I decided to give it a try.
What a joy! The little colored flag system is a great idea and enables the users to know exactly what needs to be done.
This is not a "Translation" tool. You need to use your own translations.
Make sure all your menu items and articles are set to "Language: all".
Harald also offers great support and got back to me right way to solve a minor issue (my mistake).
The Extension is free, consider donating!