Would it be possible to keep our Progress, Difficulty and Categories settings separate for different languages? Since I've found out about the tier system, I've been switching back and forth a lot between languages. It would be nice if changing my settings at any given time in the Spanish section didn't alter my Portuguese settings as well.
Also, could you make it easier for us to quickly check our stats? Having to open an article every time makes it tedious.
I agree with your point of having the immersion tiers outside of articles as well. Perhaps on the home screen next to the other information (such as coins, lingots) or maybe when you initially click on the immersion tab?