Draft: 2692 define default translation lang
@arnauvp Please take a look at the changes and confirm that they are in the right direction.
Also, while making changes for the file
pages/what-s-e.md I realized that making this i18n transition across all files will take a lot of time. Do we have data/analytics on where is the most accessed/used parts of the documentation? This way, we can focus on the most important ones.
When I say that the transition will take time, I really mean it. I can't make the estimation to you, but I'm pretty sure that it will take days/weeks, which got me thinking that I must have the wrong approach to the problem. Tell me if I missed something.