A few years ago, when I started working with Drupal I was needing some multilingual blog to publish about my work and thoughts in two languages. Then I started this Internationalization module which I've been maintaining for all that time. Now, 7 years and a lot of versions later, it is still is quite hard to build a multilingual site with it.
There is a reason for this -someone would call it an excuse- and that is: Internationalization module is not a multilingual solution. It is an API module, or a toolbox, to build many of these different solutions. Just like Drupal is not a web site, but the tool to build thousands of different great web sites.
'Yes but, How does a multilingual solution look like?'