In this related issue, there was a proposal to hardcode the authors and the tags. That is for us not an option, as there are too many. It sounds for me like a must-have feature if you have different languages on the site to not mix the languages of the post up.
Yes, I have seen and followed the tutorial. It works perfectly for the index collections:
/ -> has only english articles
/nl -> has only dutch articles
However, the are tags and authors pages which display both languages at the moment. I would like to have something like this:
/tag/tech -> only english articles in category tech
/nl/tag/tech -> only dutch articles in category tech